Yes, that's all true, but, let me make one final and very important point that we all know, but, might sometimes forget, especially when we are evangelizing.
An unsaved person cannot wake up one morning and say to himself, I think that today, as of right now, I'll become a Christian. He would be a false Christian because it doesn't work that way. A person must come under the convicting power of the Holy Spirit, now knowing that they are a sinner and in need of a Savior, and if they say yes to Jesus and receive Him into their heart as their Savior and the Lord of their life, they will be saved.
Now, could that have happened to Hitler in those closing moments of his life? Yes, it is a possibility, but extremely unlikely and for many reasons, which I'm not going to go into.