Christians, will Hitler and his cronies go to heaven if he had faith in Christ?

No, wrong. Jesus said you'll know a person by their "fruits", and He also said that not everyone who calls Him Lord will get to heaven. Only those who do the will of God go to heaven. Now, is being responsible for the systematic slaughter of over six million people a violation of Jesus' teachings, such as "Love one another"? And is it also a violation of the sixth commandment? Yes, and yes. Hitler probably didn't repent, so no way is he going to heaven. Same with his cronies.