2 Corinthians 11:13-15 says,
13 For such men are false apostles, deceitful workers, disguising themselves as apostles of Christ. 14 No wonder, for even Satan disguises himself as an angel of light. 15 Therefore it is not surprising if his servants also disguise themselves as servants of righteousness, whose end will be according to their deeds.
Here is an article that considers what the one world religion may be once the age of grace ends and the Revelation of Jesus begins.
Did you know that Muslims call Mary “Our Lady” just like Catholics do? Did you know she’s mentioned 34 times in the Koran and the 19th surah (chapter) is named after her? Or that both Islamic and Roman Catholic doctrine hold that Allah and the God of the Bible are the same? Or that because of this, Catholic Catechism teaches that followers of both religions are included in His plan of salvation? Or that several Catholic officials have claimed that one day the two religions will unite because of Mary’s influence on both?
After these things I looked, and behold, a door standing open in heaven, and the first voice which I had heard, like the sound of a trumpet speaking with me, said, “Come up here, and I will show you what must take place after these things.” Even so, Lord Jesus.
This and two bucks won't buy much at Starbucks!