The percentage of republicans who actually geniunely believe the big lie would be very very small, maybe that idiot who believes in demonic possession running in Michigan, but thats about it. For the rest its a performance piece.I think some of them are genuinely theocrats, some are hard nationalists who want to close the borders and turn back the clock on all social change.
I think a vast majority of them though are just grifters who would say and do anything to get or stay on the gravy train.
Which is why Trump is their perfect figurehead.