The only people who ever claim God is on their side, are people who already suspect they are in the wrong.
People who are doing the right thing don’t invoke God — they don’t need to. It’s clear to them — and usually to everyone else — that they are doing the right thing.
People who invoke God for their cause are invariably running a shady operation, if not simply working for the powers of darkness. They claim God is on their side to firm up wavering support from people who have already started to doubt them.