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Absolutely. It will make you question anything that means something to you, or anything you can't handle. For example, if you couldn't handle God not being real, OCD would have a great time with that.

What you're talking about literally reawakened my Ocd because I thought I was sinning because the ocd was making me question the existence of God even though while it was going on I was scared to death because I didn't want it to affect my relationship with God. I didn't want to lose my ability to believe in Him etc.. Looking back now I can clearly see the fact that if I care that much about losing my ability to believe in God and i feel extremely scared about doing so then I obviously believe in God. But ocd can make your ability to think rationally go down the toilet because you're just drowning in your own anxiety! From personal experience, I don't think I'm actually able to make sense in my mind if I am scared so I try to get rid of the anxiety first.

For sure it can. I had a terrible time with this one when I was using a certain belief system. It was awful, so many doubt, reassurance seeking, googling information for hours. Things got better. I actually did some studying and changed to another belief system. Years later ocd came back after a huge stressor and the doubts, anxiety and reassurance seeking came back but with the new belief system. It's ocd. I think the clue is when you can't think of anything else until you get the answer. What worked for me was deciding that whatever is out there, if anything, it probably understands about ocd.

yes , i have existential ocd and i have a hard time believing in God so it makes my OCD worse