I know several converts who are sincere in their conversion who originally came to Judaism because they married a Jew. I am not saying that the majority of these kinds of converts are sincere, but I have good reason to believe that it can work out. There are cases of Jews who lost their faith, met a partner, then did Teshuva and had the partner decide if she wanted to convert. I will not condemn any convert because, quite interestingly, last weeks Torah portion "Mishpatim" {which is my Bar Mitzvah portion} contained the mitzvah not to opress the Ger {convert, proselyte} because we {Jews} were strangers in Egypt.