If they just wouldn't have killed him he wouldn't have been able to come back and prove that he's holy. Then Christianity may not have come to existence, and we'd instead have the much cooler Roman gods.
In Raised by Wolves it's a timeline without Christianity where it was Mithrism (a competing mystery religion around the time Christianity was starting) that succeeded to one day be at odds with atheism.
The first season is pretty good if you like the Idea of seeing what a SciFi scenario sans Christianity but a different pagan tradition instead might have looked like.