For and Arcana Domain Cleric (SCAG), the Arcane Initiate feature says: "you gain two cantrips of your choice from the wizard spell list. For you, these cantrips count as cleric cantrips." I can see three possible ways this could be interpreted:
You still get a total of 3 cantrips at Level 1, of which 2 may be wizard cantrips, or
You still get a total of 3 cantrips at Level 1, of which 2 must be wizard cantrips, or
You get 2 wizard cantrips in addition to your 3 cleric cantrips, for a total of 5 at level 1.
You would absolutely have 5 Cantrips, which is actually pretty powerful. And when you first select them, 2 of them MUST come from the Wizard spell list. While Clerics do learn additional Cantrips, they cannot replace Cantrips they already know, so a Cleric would be locked into the 2 Wizard Cantrips they chose. And you could not use your later opportunities from being a Cleric to learn additional Wizard Cantrips, either, because it's the base Cleric class that gives you the additional Cantrips, not the Arcana Domain's special access to Wizard spells.
The total is 5. You gain 3 Cleric cantrips just for being a Cleric. You *gain* two off the Wizard list that count as Cleric cantrips because of your Domain features. If those two were meant to be 2 of your starting 3, it would have said something like "when choosing your initial 3 cantrips, you may select up to 2 of them from the Wizard spell list, and they count as Cleric cantrips for you".
And 5 cantrips is not over-powered. Sorcorer/Warlock at 2nd level gets 6 cantrips
Sorcerer gets 4 by itself, Celestial Warlock gets another 4, two normal warlock and Light and Sacred Flame. Human Variant can take Magic Initiate to get 2 more for a total of 6 at level 1 and 10 at level 2.
I do think that 5 at level 1 without any from racial bonuses is the most though.
Oh some of the Mark variants might give more than 2 cantrips, but I doubt it.
For and Arcana Domain Cleric (SCAG), the Arcane Initiate feature says: "you gain two cantrips of your choice from the wizard spell list. For you, these cantrips count as cleric cantrips." I can see three possible ways this could be interpreted:
You would absolutely have 5 Cantrips, which is actually pretty powerful. And when you first select them, 2 of them MUST come from the Wizard spell list. While Clerics do learn additional Cantrips, they cannot replace Cantrips they already know, so a Cleric would be locked into the 2 Wizard Cantrips they chose. And you could not use your later opportunities from being a Cleric to learn additional Wizard Cantrips, either, because it's the base Cleric class that gives you the additional Cantrips, not the Arcana Domain's special access to Wizard spells.
"You gain [...]"
You have a total of 5 cantrips, two of which must be from the wizard spell list, 3 of which must be from the cleric spell list.
The total is 5. You gain 3 Cleric cantrips just for being a Cleric. You *gain* two off the Wizard list that count as Cleric cantrips because of your Domain features. If those two were meant to be 2 of your starting 3, it would have said something like "when choosing your initial 3 cantrips, you may select up to 2 of them from the Wizard spell list, and they count as Cleric cantrips for you".
And 5 cantrips is not over-powered. Sorcorer/Warlock at 2nd level gets 6 cantrips
Sorcerer gets 4 by itself, Celestial Warlock gets another 4, two normal warlock and Light and Sacred Flame. Human Variant can take Magic Initiate to get 2 more for a total of 6 at level 1 and 10 at level 2.
I do think that 5 at level 1 without any from racial bonuses is the most though.
Oh some of the Mark variants might give more than 2 cantrips, but I doubt it.
Thanks, everyone, the consensus seems to be that I was misinterpreting and short-changing myself.