sorry, I know this was kind of a random topic...I just like to mention that because we live in a fallen world and we are sinful creatrues there are all types of afflictions which man must face.....OCD can often be excessively painful, and there have been many cases in which individuals (specifically faithful Christians) have repetitive, untrollable thoughts in which they blaspheme God....I believe God can use afflictions to bring us to true sorrow, humility and obedience ......and God knows when intrusive (sinful/evil) thoughts especially one in which we are raging against God causes us grief, sorrow and misery....He understands, is merciful and will not hold us accountable (speaking specifally about the regenrate)
.....that way we don't have to dwell on the offense and fall into a vicious cycle of obsession-compulsion (in which we constantly spend our time trying to repress thougts and/or engage in some type of ritualistic compulsions to compensate)

don't know if anyone here is affected by this condition or know somebody who is but I thought this post may be a blessing!

http://www.monergismbooks.com/OCD-Freedom-for-the-Obsessive-Compulsive-p-18020.html

The mercy of God is necessary not only when a person repents, but even to lead him to repent, Augustine