We cannot be certain

Of the justice of men who are capable of fashioning and worshipping an unjust divinity; nor on their humanity, so long as they incorporate inhuman motives in their most sacred dogma; nor their reasonableness, while they rigorously decline to accept reason as a test of truth

Morley

I am sure Barry would disagree and I would too. There are many times humans have acted better than their gods. The Christians at least have stopped using the rake to discover who believes correctly and are no longer stoning their neighbours for having the wrong interpretation of religion.

But on the whole, if one worships a cruel overlord, it is not far fetched to imagine their capacity for cruelty. Look at the Muslims chopping heads in the name of God or it name of the profit?

To be fair to religionists, it can be said any ideology believed in that admits no error and is taken as absolute truth is likely to be intolerant of divergent opinion and can easily lead to inhumane and cruel acts.