So Jesus is a literary character who DIDN"T start a church to himself, but 2000 years later a church in his honor has stood the test of time and claims it can trace it's existence back to the apostles. Plenty of countries and cultures tried to quell, but couldn't....interesting.
There's no evidence even from our earliest writings about him which suggests he established a church in his own lifetime. The first reference to an organised event for believers is after his death, and that's in celebration of a Jewish festival (Pentecost = Shavuot). Even Acts 1 has the apostles asking him whether now's the time he's going to do the Jewish Messiah thing rather than establish a church. It's all about the oral tradition and a personal salvation initially, whilst expecting his imminent re-return to do the smiting, not a church. What later happened is what later happened, but right from its beginnings there is huge variations in beliefs. Even who/what Jesus was is up for debate for centuries. You'd think that would be one of the first things to be resolved by any organised church. There's a vague common theme to it all, but there's lots of riffing on that.
How could it be otherwise when someone could stand up and claim a divine revelation which changes things? Or a new supposed saying from Jesus is passed around some communities but not others? One does get the impression that one could always corral four christians in a room and end up getting five different versions of what Christianity is meant to be.
One of my favorite quotes on the historicity/mythicist debate is "if there were a historical Jesus, there certainly isn't now". Seems to be where I'm at with things. A kernel of truth in there, but what is built upon that is something most different to what it was when it began,