This was definitely the case for me. I remember talking to this Muslim guy, although, I didn't explicitly say I'm an Ex-Muslim, I told him I come from a Muslim background, but, I'm not religious. He then goes into Da'wah mode, telling me that I need to learn more about Islam, then I'll have a better understanding, become more enlightened etc. The thing is, it's because I learnt more about Islam that I'm no longer a Muslim, if I didn't bother researching the religion, I probably would be ignorantly calling myself a Muslim, following the rituals, but, not understanding what being a follower of Islam actually entails.
Isn't it believed that you get "allah points" (Islamic browny points) if you help somebody strengthen their religious views?
I love that concept - I can possibly drink, smoke and kill all I want, but if I convert.somebody to Islam then I can do that shizzle later on in one of the seven heavens.