Every belief has an effect, what effect does one-society of ones want to have?
Your beliefs effect your behaviors,

The problems with that are far, far & far too many of our species NEVER critically think about what they believe & it's past-present-future effects & how it is applied. Just because what your family-class-area/community-town-city-state/providence-country believes something, does not mean one should believe it. Do the HONEST & CRITICAL examination of everything presented to one.

I will always prefer to be alone over just believing in violencing-harming-killing-torturing.

It is how religions violenced-harmed-killed-tortured unimaginable amount of our species-animals & Etc.. Think about this, even religions that claim to be peaceful religions, example Buddhism-Quakers, have fought or contributed to mobs'-govs.' violence-harms-tortures-wars. I was shocked when I first discovered Buddhas were actually violencing-harming-killing-torturing other people. & why are they doing this, because of religious differences. You want to talk about animals & Etc. holocaust, it is a holocaust that never ended. That is not to say, it is just one-reason, nothing is a island upon itself, religion. It is just point-out that a religion that their beliefs have result from, through & continue in the violence-harm-torture-killing of other people, animals & Etc..

I believe that all our minds are the most powerful individual things (working together even more powerful & working with all Beings' minds is most possible power) there is outside of things like outer space forces & Earth forces, can never control but make worse or better. With that I understand belief in no religion & all that entails has also resulted violences-harms-tortures-wars. Just a lot less, than religions!

Like my other reply there many reasons that are intersectionally intertwined.

When I use any version of violence-harm-kill-torture, I include at least mental (if you like to add spiritual, than so be it) & physical.