Back in 4E you had Wis paladins or Cha paladins, but now they all use Cha.
That said... If you just want to smite, you can dump Cha. Cha only affects spells prepared and spell power, but if you're spending all your slots on smiting, those don't matter.
Also the level 6 Aura of devotion gives a minimum +1 bonus even if your Cha is 11 or less. Dunno if BG3 implements this though.
