Should he have divorced his wife when he converted if she was unwilling to convert? At that point they already had at least one child.
If he divorces his wife, does he get custody, or her? If (when) his wife gets custody, which religion are his children likely to adopt: his or hers?
There are good reasons to not do what he did (if his conversion was genuine it must weigh heavily on him that he won't be with his wife when they die), but you don't get do-overs.
He wasn't a Catholic when he got married.
Should he have divorced his wife when he converted if she was unwilling to convert? At that point they already had at least one child.
If he divorces his wife, does he get custody, or her? If (when) his wife gets custody, which religion are his children likely to adopt: his or hers?
There are good reasons to not do what he did (if his conversion was genuine it must weigh heavily on him that he won't be with his wife when they die), but you don't get do-overs.