Hi kids,
As an ex-JW who ONLY dated non-JWs growing up, I can relate. I was never baptized and never really believed any of it, but because I lived at home with JW parents, I had to sneak around with my "worldly" girlfriends behind their backs. My advice is, it all depends on how serious your BF/GF is about the watchtower and what their future plans are regarding this. A few points to ponder:
1) Are they already baptized? This complicates things alot more because they have a lot more to lose (i.e. being formally shunned by their families) by getting "caught" with you.
2) If they really want to stay in this religion, think of what that implies for your future life together....what about celebrating holidays? Will they refuse to spend x-mas with your "worldly" parents? What about having kids? Do you want your kids to have birthdays? Halloween? Easter? Will they force your kids to not participate if the old "watchtower" guilt pops up in the future?
3) What about blood? How do they feel about this? If you had kids, would they insist that your children die in obedience to the watchtower corporation?
Think long and hard about these issues because the doubts they are having about the JWs may be real, but they may also be a passing phase and the worst place to be would be with a husband or wife that suddenly turned into a looney, zealot jehovahs witness AFTER the wedding!!! Dating a JW......you need to carefully apply some 'risk management' strategies before getting too serious.