Spirit of Idolatry

Act 17:16 Now while Paul waited for them at Athens, his spirit was stirred in him, when he saw the city wholly given to idolatry.

Col 3:5 Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry:

Joseph Herrin has an excellent series of articles titled Syncretism:

Syncretism
Syncretism - Part Two
Syncretism - Part Three - The Harlot and the Scarlet Beast

A spirit of error is blinding people from the simplicity that is in Christ, especially when it comes to the Catholic Church. Ask the Lord to show you the truth concerning these things.