In other words, a majority of Democrats are: (1) uninformed; (2) liars; and (3) anti-Christian bigots.
The last one. Anti Christian through and through.
Although all three options have their merit, I believe it is primarily #3.
Liberals/Democrats reject the God of the Bible, and they therefore hate Christians. They know, or at least have heard, Christians in this Country - and see them as being judgmental and 'harshing' on their gods of sexual promiscuity, abortion, and homosexuality. The Libs haven't had any first hand knowledge of muslims, and their culture - because the muslims here are going to lay low until they beef up their numbers. They are not going to shove Sharia law into their face - yet. Therefore the Libs will assume muslims are enemies of Christianity, and thus natural friends of the Liberal/Democrat worldview.
These 'Liberals' haven't quite thought out the end game that would occur if they were to achieve their desired ends.