No man is saved without first coming to the cross.
No many can be saved without believing the Gospel.
No man will be saved without obeying the Gospel
Peter didnt preach
Acts 2:28 on the day of Pentecost. He preached the Gospel (the same thing all bible believers preach)
but when those who heard him preach the Gospel, they asked what they needed to do. Peter told them.
Jesus told Peter that he was the holder of the keys.