DanielC,
It is not a quick process to "join" the Jehovah's Witness religion and is even more difficult to leave the religion. You have to have a personal bible study that last for months, attend meetings every week, comment, "mature spiritually" to the point of baptism, and then after that, your motives would be questioned about your interest. I'm not saying it hasn't been done before, I know of some sisters that put the engagement ring on the day their worldly boy friends got baptised.
I would pursue other romantic interests if I were you, that were not associated with Jehovah's Witnesses. But, unfortunately, what I have seen is just telling someone that it's going to be a very painful experience if you pursue dating x person, and they will do it anyway and then when they are hurt they will come back to me and try to put the pieces together of how it all happened. We drink a lot of Scotch to help ease the pain.