Your disability is not a punishment from god, nor is it a blessing. It just is. For some people, praying or meditating helps their stuttering, making them calmer and accepting of it. But if the anxiety or frustration of thinking there should be a god to help you that isn't there tangibly is too much, then yeah, let it go and focus on the things you can do, like therapy or friends to talk/write to about it, so you're not holding onto all of that alone. The hard reality is that there is no "cure" or easy solution or godly works that the church and other scams promise. You may always have to live with it; it may get worse, or improve to the point it is unnoticeable. Just try to find people who don't suck, you can surround yourself with.