You’ve hit on it. It’s an attempt to destroy Christianity, because the left hates Christians more than it fears Islam. All the left’s animosity towards religion is directed towards one religion in particular.
If you spend 5 minutes on Huffingtonpost it will verify what you just said.
The excuse is always:
All religions are bad.
Christians have also done bad things in the past.
They are doing this because of the crusades or some other past even.
They they go one to bash conservatives, Christians, etc.
Liberalism really is a mental disorder.