what cantrips? They start with three, get a fourth at level 4 and the good cantrips available to them consists of ...
three options. Getting one of those three from another source is going to imbalance clerics even less than high elves imbalance wizards with that extra cantrip because wizards actually have a larger selection of good cantrips. We got started on this because you tried to
claim that more characters having access to guidance would be a problem while missing that they usually do have "access" to it through their nearest cleric