Limiting the view to the relatively short time of the #Crusades and the conquest of the Americas by Europeans is a very limited view.
In the first centuries after the death of Christ, Christianity spread throughout the "known world" of the #RomanEmpire peacefully, in fact the members of the sect often being persecuted by the authorities.
In fact, the picture you show of a #crusader has a reason. The military...
...expansionism of islam and the conquest of the #HolyLand, which had belonged to the #Roman and then its heir, the #ByzantineEmpire, by invading #Arab forces, expanding throughout the #Mediterranean and beyond.
So, the crusader picture does not really support your story.
What you are saying would be true for large parts of #LatinAmerica, though.
...as a way to control the subjects of a ruling elite is something that has been done throughout human history and is certainly not limited to the Christian and Islamic faith.
It might despicable from a moral point of view, but it is a very powerful tool from a strategic point of view and will therefore continue to be (ab)used in the politics of power.
Reading a book about the history of Catalunya and the first chapter is the period 1000-1400AD when the Crown of Aragon was expanding across the Mediterranean. It mentions the multiple instances of persecution and pogroms against Jews, the worst being in 1391 including in Valencia.
How about everyone just stops hating each other for a few hundred years.... lets try that?
The anti-abortion crusade (because that’s what it is: a pre-modern overtly violent Christian campaign to conquer The Others™) is a vestigial throwback to ancient Roman policy of “partus sequitur ventrem” which became English common law, and the American colonies adapted it to weaponize sexual violence against people who were considered property (i.e. chattel slaves).