The links you give were interesting and disturbing. I would venture that the dangerous thing about these people is not that they are theists, but that they are fanatics and possibly a little mad.
The bible can be interpreted in many different ways. I know people who are strong believers in God that are very good people and I have met others who are out and out hypocrites. As Raul said, your parents used their religion to justify their atrocious behaviour.
I don't expect to convince you; anyone going through what you have would probably either share your views or grow up to use their religous fanatsism to justify their own "mad behaviour".
I understand why you say "be wary of theists" but I believe that it is only the fantics we should be wary of.