Hi, I also have OCD. Not religious OCD like you have though. Everyone has doubts at times, that's normal, you just happen to have a condition that amplifies this and that causes your brain to work against you. God understands and doesn't love you any less for it. I would encourage you to keep seeking Him, even if it does feel forced.
Also be sure to talk to some professional about this if you aren't already, someone who is experienced with working with OCD brains. Preferrably a Christian, for this kind of thing. If you have no access to a therapist or can't find one that you can afford, you may be able to do a google search for help with religious OCD, also. The internet is a vast resource and if you do some digging you can find very helpful things.
One thing you can do is challenge your thoughts with truth, ie "I don't really believe in God because I have all these douts", counter with "God's grace is sufficient for me". However, be careful, as this can become just another compulsion.
Oh! Also, you definitely need to practice not engaging your intrusive thoughts. For me, I play video games as a distraction, since they take all of my concentration. Find something that engages your mind and keeps it from engaging the thoughts. It's way easier said than done, but the way to beat OCD is to ignore the intrusive thoughts!
Try to challenge your intrusive thoughts just once with what I suggested above, and then move on. Think of your intrusive thoughts as a person inside your brain who is annoying and won't shut up. They're just attention seeking and by giving them attention you're just encouraging them to keep whining.
Also, if you are on Facebook, there are OCD/scrupulosity support groups you can join. I was in one and might be able to find it again to suggest to you