Some Christians believe that God has a plan for everyone. I grew up in an evangelical family and community (I opted out in my teens), and I did not hear people saying that. It was never part of what I was taught. People did talk about God’s will, but that’s a little different.
Hitler also survived numerous attempted assassinations, although nowhere near 600. I would guess that the same answer would apply to both.
I think everyone, including the most staunch Christians ask that same question about Hitler, child abusers, serial killers and trump. I don’t understand either.