You ask an interesting cause and effect question.
Now I have one for you:

Are humans evil because they have religions or
Are religions evil because they have humans?

The bitter divisions we see in American politics have little to do with religion.
There are members of every religion on both sides of the divide.

Let me postulate the following:

If you take any group of warring humans
and separate them onto two identical planets
Within a few years each group will have divided
Into warring subgroups.