It's always mixed. Throughout history there have been people who were genuinely converted, and people who were just told that they must do it all their lives, and so did. There were people forced to go through the motions by some threat, and there were people who went through the motions just for personal selfish reasons. There were people who honestly tried to convert/teach others, and there were people who defrauded the sheep. You can't really separate the groups very well. Since those with bad motives will lie about it, and you often can't tell a fraudster from a fool.