“Sorry, there are many different kinds and degrees of “Christians,” but if you aren’t baptized, you aren’t a Christian, according to the understanding of virtually all Christians—Protestant, Catholic, or Orthodox.”
This might be a requirement to be a member of a given church, but it is not a requirement to be a “Christian”. John 3:16 does not mention baptism. The thief on the cross beside Jesus was not baptised, yet Jesus welcomed him.
Jesus himself was not a “Christian”. He did not come to found a religion, but to draw all men to the Father.
There is also baptism of desire. And obviously the thief couldn’t get down off the cross, get baptized, and climb back up. But this is really off the point of this thread. Are you saying that Obama didn’t need to be baptized because he was like the Good Thief? Seems unlikely to me.