Is Hitler (or any other historically evil person) in heaven?
The Bible is clear (Romans 10:9) that if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, that you will be saved. I want to be clear. This is not a mental agreement.
For example, we all believe that 4 + 4 = 8. Remember that Satan believes in Jesus. The demons believe in Jesus. They will not be in heaven. To believe in your heart, as the Bible describes, is connected to obedience. When someone surrenders to Jesus, they are empowered to overcome sin with the help of the Holy Spirit. Ultimately, we are saved by grace. This is true also for non-Christians who don’t know about Jesus. God gives mercy. Not because we deserve it, but because we need it.
I do not know definitively what happened to Hitler, or any other person considered evil for that matter. What I do know is that we are all evil. If anyone repents and accepts Christ’s forgiveness, then he or she is saved. If Hitler repented of his sin and accepted the forgiveness of Jesus, then he was saved.
We don’t know who is in hell or heaven, or exactly who will all go there. It depends on their response to the grace of God. What we do know is that without the love and mercy of God we would all end up in hell because our natural nature is our sinful nature and sin separates us from God.
If you are asking whether it is possible that Hitler could be in heaven, the answer is yes. It is also possible that Ryan Weaver will be in heaven. Amazing grace, how sweet the sound, that saved a wretch like me.