One thing in my mind. They convert because they felt it is more compatible with them. Families and friends in the same religion might disagree but they could only pray to their God that he/she would go back to the right path. And I know, you cannot force someone to convert. Then don't.
Plus, believing is not enough. You must walk ahead to see the proofs that lies in front. If you don't, then walk along the path to nowhere.