I grew up Christian, and it was very hard to overcome it. So, yes, there's a special black place in my heart for Christianity. But that doesn't mean I don't see what goes on with the other religions. Most, if not all, theistic religions rely on violent, horrific imagery to promote the "good" of their god. Whether they make that imagery real or not seems to very much depend on the age of the religion. This is stated as my own opinion, I have no hard data to back this. But anecdotally, and historically, the theory holds water.
While I agree with your argument that the theistic religions rely on violent, horrific imagery to promote the "good" of their god, in my opinion, the Abrahamic religions (especially Islam and Christianity) take it to an altogether different level. I am not denying that the Hindus and Buddhists have sometimes relied on violence to spread their faith, but such incidents were rare.
I didn't specify, but I agree, except that the Buddhists are not theistic.