I wouldn’t. Whomever I’m with, whether they share my belief or not, will have to accept me as I am with my belief system. And I theirs, of course. Converting to appease someone isn’t the right reason to convert in the first place, nor the sign of a healthy relationship.
I’m Christian, but my boyfriend is agnostic. He respects what I believe and respects that that’s how I’m raising my son to be and does not interfere with that. I like that he knows it’s important to me. I know he doesn’t quite know where he falls in what to believe, but I don’t try to convert him. I will simply set an example of what I believe, and if he finds it awesome enough to join in, then that’s great.