Hey Serenity...I think it's wonderful what you're attempting to do...if only it could be that easy. I am a gay man who left the JWs, and I write a blog for Freeminds.org on my experience. I think that the conclusion you could draw from all of the comments to your question is that all of the people who wrote in are correct. It usually takes a combination of things to allow a gay person to find their way out of the Kingdom Hall, and as you know, there really is no room in the Kingdom Hall for gay or lesbian people. Being condemned for something you have no control over is an impossible battle, and I hope your friend finds his way out (although of course, it is possible that he is not gay, but it's nice of you to be supportive.)
In my case, I made it out of the Kingdom Hall by accident. It had nothing to do with being gay, and it was only through time, and supportive non-Witnesses, and even things like TV (per one of the comments to your post), that I was able to see clearly. I think that accepting the fact that I am gay is what allowed me to abandoned The Truth once and for all, but your friend is going to have to find his own path out.
You might suggest that he visit a few choice websites for additional information. I don't know how on earth you would do that...perhaps, "Hi Friend. I think you might be gay. Have you ever visited XYZ.com?".....okay, that won't really work. I don't know how you will get him to view information that refutes what he has been told by the Witnesses, but information is key.
And there is a group devoted to LGBTexWitnesses called A Common Bond.
You could also refer him to my blog on Freeminds.org titled A Gay Exit From The Truth which is http://www.freeminds.org/blogs/a-gay-exit-from-the-truth/
Additionally, Freeminds now hosts a forum for gay and lesbian Witnesses to share their stories (and hopefully offer support). That forum is titled In And Out of The Kingdom Hall Closet at http://www.freeminds.org/lgbt-forum/
Thanks so much, Scott Terry