Hard to say, except history shows that all the major religions are subject to incorporating and syncretizing other religious concepts. We certainly see that with the liberal Christian churches, which hold nothing dear, except multi-culturalism.
But, wait, did I say "all?" My mistake. One major religion has no history or doctrine at all of real accomodation: Islam. The Muslim doctrines of taqiya and Hudna allow the appearance (temporary) of accomodation until Islam is strong enough to get the upper hand. There is well over a thousand years' history of such false accomodation where Islam is the minority. Somehow, it is never found in a majority Muslim land in practice, though sometimes on paper.
What I say to you I say to everyone: Watch MK 13:37