For me at least, God and organized religion are two different entities. It seems like your brother’s problem is with organized religion more than with God.
... or maybe the other way around. During the Soviet Union the elite would send their kids to private religious schools. This is the reason why teachers who belong to unions also send their kids to private schools that boast religion organized teaching. Yeah, how is that for separation of church and state in atheistic socialist and communist statist countries!
Yes indeed, that is the big hypocrisy of socialists and atheists right there. They hate God, but they like the discipline that engineers their sex gizmos at German factories.