I don't know what kind of evidence you're thinking. My argument is based on the straightforward policy positions of the parties, and especially how the times have changed yet many positions have not, with some policies even changing in the opposite direction of social changes. Other core policies have been outright rebuked - can you imagine Reagan appeasing Russia by shunning countries desperately wanting to be our allies?!?

If you want to point me at other conservative principles I skipped over but seem overridingly relevant to you, please do. But even for the social issue of religion, which seems to be the defining aspect for many people, the figureheads are churchgoing Biden versus philandering Trump.