[docmcb]

Islam is the most successful of the Christian heresies.

[Bosco]

Islam is the most successful of the Christian heresies.

Hear, Hear!

[RightWhale]

"The greatness of Islam is that we combine Judaism and Christianity

Islam could be viewed as a Christian heresy, except: I don't think the Prophet [TUB] claimed to be Christian to begin with, so Islam is not a heresy, not on this planet, anyway.

[Jack Barbara]

Islam is the most successful of the Christian heresies.

I would reserve the #1 Christian heresy position for Catholicism. The #2 position would go to Protestantism. Perhaps Islam is a distant third.