Agreed. The question is whether religion can condition somebody to be abusive who wouldn't be otherwise. If you really are convinced that your child will be estranged from God because of their sexual behaviour then yes, I think it can.
I'm not sure that 'condition' is the right word but I can see the point in that if you subscribe to such a view then you don't see the activity as wrong. That said I think that applies to almost any set of beliefs (rather than the absence of one) - in Hope's example the father has to believe it is wrong to talk to non atheists , and that is a specfic belief.
Yes, we can think of atrocities such as those committed by adherents to Naziism.
I think that religion can be conditioning because of the influence that church leaders and pastors have. There are accounts of parents standing by during 'exorcisms' and I wonder in cases such as this whether the parent isolates their child at the suggestion of their church leadership or through reading 'advice' on Christian parenting.
I once was involved in an online discussion with a new convert to Christianity who had fallen under the spell of an evangelical couple in France. They quite literally had a rod, a small fine stick, to beat their child with, and this woman dropped into the conversation that she was planning to do the same when her child was old enough. Fortunately the horror of our reaction brought her up short and we were able to point her in the direction of more balanced approaches to Christian parenting, but had she not had such hero worship for the couple she knew I doubt such a horrific idea would ever have occurred to her, and maybe they still convinced her that they were right.