Before people start fighting me over the subject, I first want to say that actually I am a Christian and I go to church every Sunday and participate in many of the church's activities. However, I am really convinced that if we go back the moment humans were created on this earth, and take away every religion, there will be world peace... I don't know about you but I would really love to know your opinions.
No, because if you have Nutella and I didn't have Nutella, you would catch these hands and I would take the Nutella for myself. However, existence wouldn't exist if existence didn't first exist. So, which came first: The chicken or the egg?" If we identify God as the chicken and existence as the egg, then the chicken came before the egg. But if the egg came first, then there would be no chicken to incubate the egg and the egg couldn't be. So if you take the Creator out of the picture, the creation could not create itself and the whole premise falls apart.
More to your exact point, without religion people would find other reasons to quarrel. If you think religion is the only reason to get in a heated debate (or a war (haha)) you should try pushing someones buttons on the issues of racial inequality (White Supremacy, Black Lives Matter, White Privilege, ect.), the ability to decide your gender and project your beliefs on the general public (I have chosen to identify as a Thick & Rich Eggo Waffle. You need to use the right pronouns now. Thank you.), whether homosexuality should be recognized as a valid marriage, and most recently, Flat Earth vs. Round Earth. I'm being flippant about these issues to show how easily beliefs can be targeted and triggered. Religion is just one means of segregation. It shouldn't be, but it is.
Thick & Rich Eggo Waffle out.