WALK AWAY! You will get sucked in and your family unit will suffer because of it. Even if he doesn't believe, there are certain traditions to be followed. I am not a disgruntled ex-Witness as Teary mentions, I'm still a baptized JW and have succesfully blackmailed the organization into not disfellowshipping me.
As you can see from Teary's response, the ad-hominems and attacks against those that do not agree with every single position the Watchtower leadership takes will never stop and Teary is just a scratch on the surface. They will attack your side of the family, your current faith (or lack thereof) and practices. If you have JW at your job and you actively go against their tradition or try to prevent your loved ones from getting brainwashed, they will sometimes put pressure on you there or say things that may get you in trouble.
This may sound over-the-top what I just said but depending on the people there, they may or may not do any or all of the above. It has happened to some of us, read some of the stories on here. I lost my wife and newborn baby to the cult after succesfully protecting them against the harms of the blood transfusion teachings, I KNOW what I'm talking about.
I have documents (posted on here elsewhere) about a woman that chose abortion because of an ectopic pregnancy (and everyone knows that there is no way a mother can survive nor the baby come to full term) and they punished her. I have documents (posted on here elsewhere) about a young man being punished because he is a homosexual and the graphic details the church leadership asks for during those closed-doors, no representative, illegal 'judicial' proceedings. I have documents (posted here and on the Internet) about their financial systems, their official responses, rules and documentation to the victims of child abuse (2 witness rule, forced confrontations with the abuser without professional help, recommendations to report anonymously so as not to involve the church and to hide and protect abusers claiming ecclesiastal privileges).
You can't see it from the surface but they are DANGEROUS. They are INSIDIOUS. STAY AWAY. I know it's hard for your man and I lost everything and everybody to them (EVERYBODY) as well, I live right now in a cheap shared apartment with 2 roommates. The contact with that side of the family is not worth it, the only way they will accept him and you is if you live by THEIR standards, no other way is possible to them.