A world without Christianity

[Grasshopper]

I think if there was no christianity (invented), things would be so utterly different that you can't just swap around a few events and say "this is what would have happened instead". In my opinion, if there was no christianity, a different religion would likely have taken its place. Maybe it would have been worse, maybe better.

My history isn't great, but it seems to me that xianity was the winner of a brawl between several religions. Take that away and another one wins instead. But I think the one that wins is fairly likely to be ruthless in nature, given the times.

It's also so different to how it was back then as to be a new religion now anyhow. At least while it's being kept in check by secularism.

I know you can't swap a few events around but for arguments sake I added whichever events came to mind.
Also, out of all those religions the outcome could've been no religion too. Think about it, Paganism lingers for a century or 2 and later an atheist movement grows.
Good answer and you argue really well so a question specifically for you.
Now with the historical events I've listed, can you tell me how YOU think events would've gone forth differently from what I wrote if Paganism was replaced by atheism by lets say the 8th century? Or take any century you see fit.
Remember we're all just speculating.
I'll be eager to read an answer tomorrow