Bringing Down the King

[Cinjin]

At what point of his life would you have to kill him to avoid the entire religion taking off??

I'd say before he gains any kind of support. Take him out, and do it out of sight. Make sure he disappears and make it as so he never existed. Tis very hard to kill a martyr, so it's important on how you deal with them. Like Bin Ladin. You shoot him dead in front of many, a martyr he'll become. There are ways to prevent them from becoming a martyr. Take him out quietly, make him...disappear....
Or lock him up till he dies of old age, heck even shoving him in a bag and dumping him into the ocean is good enough.
The Romans made the mistake of executing Jebus in front of all his followers. Big mistake. Should of just slit his throat in the middle of the night and destroy the body.
Thanks to the Romans mistake, now even today millions think he was a god or somink. Stupid Romans! You did it wrong!

RevJer addes to that point by saying the time traveler would have to kill baby jesus in order to guarantee that the disease didn't spread. Perhaps instead of killing innocent babies, the TT could kidnap Jesus and raise him with some proper parenting. Obviously Mary and Joseph really screwed the fuck up since their son grew up with a MASSIVE god complex!