Yeah, athiest paladin for me is just a no-go. Addressing the elephant in the room firstly- atheist paladin is such an antithetical bizarre concept to wrap your head around- all their abilities revolve around divine power, but simultaneously somehow are not connected to the divine. What. Does the idea of playing a character concept so fundamentally antithetical to itself carry so much novelty that it justifies its existence and the gutting of a classic D&D class over just playing IDK, an Eldritch Knight or some other variation of 'magical fighting man'? Paladins to me, much like clerics are a roleplay-heavy class because of their religious faith. Perhaps even moreso because they are expected to be a living paragon of their religion. Stripping that away basically removes the biggest draw of the class. All that you are left with is a magical fighter that has to abide some arbitrary 'good guy' code to keep their fightin magic...or not, since you can just become an oathreaker for no consequences and just keep your powers with no drawbacks, except they are edgy now for some reason.