Blue
Ravenous Bugblatter Beast of Traal
Bull. Back in earlier editions that was true that a cleric was required as a healer. It's not in 5e.I am actually saying he should keep his Cleric and agree to help his party through healing. That is the Cleric's primary job! Everyone in the party has an important role to play. He should accept his very important role.
If he had picked a fighter no one would be asking him to heal. It seems no one in this group decided to play a healer. That's not on the OPs shoulders.
Now, if the other players heard he was playing a cleric and just assumed, it's on them. And narrow thinking that the a cleric must be a healer is what contributes to that sort of mistake.