Whether the husband, being converted to the faith, may remain with his wife is she be unwilling to be converted?

Objections

Objection 1 : It would seem that when a husband is converted to the faith he cannot remain with his wife who is an unbeliever and is unwilling to be converted, and whom he had married while he was yet an unbeliever. For where the danger is the same one should take the same precautions. Now a believer is forbidden to marry an unbeliever for fear of being turned away from the faith. Since then if the believer remain with the unbeliever whom he had married previously, the danger is the same, in fact greater, for neophytes are more easily perverted than those who have been brought up in the faith, it would seem that a believer, after being converted, cannot remain with an unbeliever.
Objection 2 : Further, "An unbeliever cannot remain united to her who has been received into the Christian faith" (Decretals, XXVIII, qu. 1, can. Judaei). Therefore a believer is bound to put away a wife who does not believe.
Objection 3 : Further, a marriage contracted between believers is more perfect than one contracted between unbelievers. Now, if believers marry within the degrees forbidden by the Church, their marriage is void. Therefore the same applies to unbelievers, and thus a believing husband cannot remain with an unbelieving wife, at any rate, if as an unbeliever he married her within the forbidden degrees.
Objection 4 : Further, sometimes an unbeliever has several wives recognized by his law. If, then, he can remain with those whom he married while yet an unbeliever, it would seem that even after his conversion he can retain several wives.
Objection 5 : Further, it may happen that after divorcing his first wife he has married a second, and that he is converted during this latter marriage. It would seem therefore that at least in this case he cannot remain with this second wife.