It was fear. He didn't want to see a united Germany. Stalin made it clear to me - I spoke with him many times - that they couldn't afford to let Germany build up again. They'd been invaded twice, and he wasn't willing to have it happen again.
My dad doesn't like religion much, but I grew up very close to the Baptist tradition. God isn't this distant thing. God is right here with you all the time. He's your buddy, and you can talk about everything.