[Note to Dennis: whether Jesus walked the earth or not, the words attributed to his tongue speak the truth, no more or less than those of the Buddha whose physical presence also cannot be proven or disproven].
The origins of Christianity aren't down to a little group of humble fishermen on the shores of Galilee.
Matthew, Mark, Luke and John are fictional.
Their gospels were written by Flavius Josephus and his cronies.
To the Jews, Heaven meant residence in the Davidic Kingdom, a cultural utopia.
The establishment of the Davidic Kingdom, the coming of a Messiah who was a Warrior or warlike in nature was mooted.
To counteract this War archetype that motivated the Jews,
The Romans constructed the Prince of Peace archetypal Jesus.
"I am the door: by me if any man enter in, he shall be saved, and shall go in and out, and find pasture." ~ John 10:9
That could well mean the Door to Rome.
The whole scam was a ruse to quell the Jewish rebellion.
The previous Caesar family, the Julians nearly busted Rome's finances with their military campaigns, another approach was needed.
The Flavian Caesar Vespasian gave himself the status of 'deity',
his son Titus then became the Son of God.
That's where that came from.
The first Pope was a member of the Flavian household along with the first couple of Christian Saints.