Sometimes people with religious scrupulosity fear that ERP therapy itself is sinful. It’s true that ERP therapy will definitely ask you to do things outside of your comfort zone, things that will probably make you sick. (This is how ERP works, and it is crafted specifically around your own deepest anxieties.)
But once embarked on this ERP journey, I think it’s unwise and counterproductive to try to convince yourself (or convince others … or let others convince you …) that your therapy is not sinful. (After all, the whole point of this therapy is to embrace the uncertainty!)
If you are a Christian and concerned about ERP therapy, I suggest you say a prayer like this then dive in headfirst:
Lord, I am terrified about what I am being asked to do through this therapy, and I worry that it might be sinful. But there is at least some part of me that believes this is connected to OCD, so please cover over all I have to do with your grace. I am doing these things in the hopes of restoring my right and healthy relationship with you. Please be honored by my therapy and my choice to fight for my freedom (which you won on the cross) and my relationship with you (again, made possible by the cross). Be glorified in my therapy, and cover anything sinful with your incredible grace. Make me strong enough to complete my exposures. Provide the strength I need to press through this scary therapy, and let these hard exposures and choices (that may sometimes seem wrong to me) glorify you. Amen.