The Morality of Doctrinal Exclusion

If doctrinal exclusivism is true, does that mean there's something wrong with Christianity or that Christianity is false? So I wanted to talk a little about the morality of the question. If Calvinism is true, what follows is not that God is a monster, but that our moral intuitions, which judge the Calvinist God monstrous are fallible. And then we could go from there.