Here's one off the top of my head though:
Back when he was potus ISIS was running rampant across the ME torturing and/or murdering just about everyone they came across.
When they captured a foreign downed pilot (I forget what country he was from) they soaked him in gasoline, put him in a small cage, and set him on fire and let him burn to death; they also posted video footage of it online so just about all of us who weren't living under a rock saw it, except for those who didn't have the stomach for watching it.
In response to that, Obama commented at some kind of get-together (can't remember exactly where it took place; WH I assume) ceremony with hundreds of people attending that (and I'm paraphrasing here) "...before we get on our high horse, let's not forget about what Christians did during the Crusades. They did horrible things in the name of Christ."
This pissed off many of us who have Christian beliefs, and rightly so. It is not the kind of comment someone who is a true Christian would make right after ISIS (who is a muslim group) burned a man alive and posted it on internet for world to see.
What the hell does some shit that happened over 900 years ago (at least) have to do with ISIS pieces of shit burning a man alive in the current time? Nothing, absolutely nothing.
In effect, he was downplaying the evils of Islam and tearing down Christianity (even though real Christianity had jack squat to do with crusades; it was roman catholics, not Christians I don't give a shit what anyone says). This is far from being the only example of him to seemingly favor Islam over Christianity though. There were many more.
And yes, I know this post is gonna make certain snowflakes here lose their shit but so what? It's the truth.