What is religious syncretism?
Answered from the commentary of William Kelly, Samuel Ridout, L. M. Grant and 3 others
Religious syncretism is the mixture of one religion with another. It joins forms of worship, beliefs, or customs that do not belong together, sometimes keeping the name of the true God while bringing in idols or a system of human making. These authors most often call such mixture idolatry and describe it as corrupt and hateful to God. One passage says a corrupted religion may not be idolatry “properly speaking,” though it warns that it will lead back to idols.
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What the commentators say
The passages the answer is drawn from, the most direct first, with the words that bear on the question marked.
Where any religion has borrowed from another, there is said to be "Syncretism" (mixture). Fairbairn has observed, "The last religion one could describe [Gunkel does] as syncretism is the Christian" … "its founders too ignorant," he adds, "of other religions … it was a living organism" ("Philosophy of the Christian Religion," p. 518 f.).
But let us see what this proposal means. To put Jehovah and Baal-peor on the throne together is to insult God and consecrate Satan. Happily it is not possible permanently to do this, and Balaam knew it full well; but he knew also that the very attempt would do more to destroy Israel than all his rèpertoire of cursings, which would affect them no more than that of the jackdaw of Rheims, — they would "not be a penny the worse." Since his time these proposals for a comprehensive religion have been often renewed. The Samaritans worshipped the Lord and the gods of the country around. Tertullian says that Tiberias proposed to the Roman Senate to enroll Christ among the gods. It is the temptation to the large and capacious mind. Socrates who was of this type, like Solomon or Francis Bacon, advises his pupils not to be over particular in such matters; he himself only believed in the one God, but one must have regard to the neighbourhood, and the little local deities. Solomon included his wives' gods in his religion, and Bacon's orthodox Christianity had room in its temple for the golden calf. As apostatised christianity entered the heathen countries, it showed an exquisite dexterity in comprehending the heathen feasts, saints, and customs, in its scheme. In these times the proposal is renewed with all energy and from all sides. Ceaseless efforts are made to work in with popular Christianity the principles of Buddhism, spiritualism, — devilism of all sorts. Not long since a leading ecclesiastic proposed in a convocation of Christian teachers that Christianity should join hands with Mohammedanism to evangelise Africa, since the latter religion was so far superior to Christianity for negroes. This kind of thing may he called euphemistically "a marriage of the creeds," but it engenders (Rev. 2:14) monstrosities and is called not by an honourable but by a foul name in the scriptures.
This mixture, which could not be likened to pure idolatry, makes us think of the amalgam which is called Christendom, in whatever form it may present itself, from the time of Roman and Greek Mariolatry, to the much more subtle forms of Protestant Christendom, where the worship of the true God is associated with the moral darkness of the world, and where profession has no relationship to that which ought to characterize the people of God.
To understand this well, we need to go back to Israel's history in the days of King Ahab. Jezebel was an adept in the art of mixing. She undertook to unite in one the religion of Israel and the religion of Phoenicia. That is just what Romanism is -- a mixture of Heathenism and Christianity and Judaism. It is not Christianity -- yet there is in it quite a little that is Christian. Where did its superstition and image worship come from? It was all taken bodily over from heathenism, under the plea that it would help to convert the pagans. The church became very accommodating. In the 4th, 5th and 6th centuries you find the church compromising with heathen rites and heathen ceremonies to such a degree that, by the 7th century, one could hardly tell heathen from Christian temples. The amalgamation is such that it is almost impossible to separate the one from the other. Go to a Roman Catholic church, and, after sitting through the whole ceremony, take you Bible and search it from one end to the other, and ask yourself, "Is there anything like that in the Book?" You will say, "No." Where does it come from then? Go from there to a heathen temple. Observe its ritual, and you will say, "Yes, they are the same."
"What a marvellous confusion of Jewish, pagan, and Christian elements do we see here! Jewish things which have waxed old, and vanished away; preparatory and imperfect elements which the apostle does not scruple to call beggarly now that the fulness has come--revived without divine authority, and changed and perverted to suit circumstances for which they were never intended. Pagan things, appealing to the deep-seated and time-confirmed love of idolatry, and of sensuous and mere outward performances; the Babylonian worship of the Queen of Heaven; the intercession of saints and angels, the mechanical repetition of formulas, the superstitious regard of places, seasons, and relics. Buried among these elements are some relics of Christian truth, without which this ingenious fabric could not have existed so long, and influenced so many minds--a truth which in the merciful condescension of God is blessed to sustain the life of His chosen ones in the mystical Babylon .
The prophet then mockingly bids them come to their haunts of idolatry, but in such terms as to intimate the contrariety to God. "And bring your sacrifices every morning, and your tithes after three years: and offer a sacrifice of thanksgiving with leaven, and proclaim and publish the free offerings: for this likes you, O ye children of Israel, says Jehovah." It was dismal, the mingling of heathenish will-worship with the relics and reminiscences of Jehovah. It is bad enough to be careless and unfaithful in the true worship of the true God; it is the gravest insult to mingle nature worship or false gods with the true, keeping up a measure of imitation, but with marked departure from the revealed ritual.
Decimated by lions, these poor ignorant pagans who likened the God of Israel to their own false gods understood this judgment. They were more intelligent than the Lord's people (v. 26). The king of Assyria had one of the priests who had been carried away captive sent to them in order to "teach them the manner of the god of the land"; but this priest himself had supported the dreadful mixture of idolatry with the worship of the true God and so was unable to teach them anything but his own corruption, so that on the one hand they learned "how they should fear Jehovah," whereas, on the other hand, "every nation made gods of their own, and put them in the houses of the high places that the Samaritans had made" (v. 29). A corrupted religion — this fact which is so evident must nonetheless be especially insisted upon — cannot lead men on in the truth and will always mould them according to its own pattern. And so it is said, "They feared Jehovah, and made to themselves from all classes of them priests of the high places, who offered sacrifices for them in the houses of the high places" (v. 32). Had not Jeroboam done the same thing with regard to the priesthood? That which they learned from the priest of Samaria led them on in that same path, only they go a little further and the priests whom they establish, following the pattern set by Jeroboam, became simply priests of their idols (v. 32, cf. v. 29). The word of God repeats that "they feared Jehovah, and served their own gods after the manner of the nations, whence they had been carried away" (v. 33), but it adds in verse 34: "To this day they do after their former customs: they fear not Jehovah, neither do they after their statutes or after their ordinances, nor after the law and commandments that Jehovah commanded the sons of Jacob, whom he named Israel." Let us not forget that the fear of the Lord, this first step in the path of wisdom, cannot be allied with the idolatry of the world, no more with heathen idols than with those of the present-day world which, in rejecting Christ, has recognized the overlordship of Satan. Those who in appearance fear Him, in fact do not truly fear Him if they do not obey Him, for to fear Him is to obey Him. God does not tolerate mixtures.
The history of that which happened after foreign nations were brought in shews the strange confusion which had taken place in Israel. It is one of the former priests of Jeroboam's system who comes to instruct them in the fear of Jehovah. Together with this they worship their own gods. A medley, hateful to the Lord, is the consequence. In the same way that, in spite of their unfaithfulness, Jehovah retained His sovereign rights over the people, we find Him also vindicating His claim to the land after the people were driven out. He maintains these rights for ever. 2
Calling the festival by Jehovah's name did not touch its real nature. The foot will show itself, despite the garments of light which clothe the demon. It was kept in true pagan style; the camp rang with loud antiphonal songs, and was wild with voluptuous dancing. Israel thus practically grafted idolatry upon the worship of Jehovah, and in so doing brought down upon their camp the wrath of God.
Men still have their excuses for breaking God's laws, and for rejoicing in profanities, which are called "holy" feasts, but god's words respecting the mixture of paganism with His worship, and His utterance against Israel's iniquity, are not to be forgotten; "They have made them a molten calf, and have worshipped it, and have sacrificed thereunto." (Ex. 32:8.) God did not in any way say, "They have worshipped Me when they bowed to the image; they have sacrificed to Me when they built their altar, and offered their burnt offerings and peace offerings there." No Israel had witnesses against them; the mount burning with fire, towering over them towards heaven, witnessed against them. God who is a consuming fire, recognized them no longer as His people. (See ver. 7.)
How forcibly are we here reminded of a proposal made long after this, by a king of Egypt, to Abraham's seed. "And Pharaoh called for Moses and Aaron, and said: Go ye, sacrifice to your God in the land" (Ex. 8:25). Thus, it would seem ever to have been the design of the enemy to get the people of God, the holy seed, to defile themselves by worshipping or sacrificing to God, in the world; i.e., to make their character, as worshipers of God, accord with that of men of the world — men holding a place in society where Christ is an outcast; thus, of course, declaring that there is no difference between the religion of the world and the religion of God — a truly fearful delusion, calculated to lead many souls out of the way of truth and holiness.