6thgen, a few questions.
Do you have any gay/lesbian relatives or friends? Think real hard on this one.
Does the church you attend allow you to read the bible or is it read to you in a foreign language that you don't understand?
Having said that I'd like to address a few points.
Homophobia = The fear of being gay, not the fear of homosexuals.
I in all honesty cannot even begin to listen to or offer credibility to a person who states they are christian and then quotes verses from the old testament to admonish or damn gays/lesbians. Flat out can't deny it unless you were there that Jesus never said anything for or against homosexuals. I personally believe that if it was truely as big a deal as some make it out to be he might have found a moment in his time on Earth to bring it up. If you are a christian than you follow the teachings of Jesus hence the NEW testament. If I'm going to hell for lying with a man as with a woman then you best put down that oyster, shrimp cocktail, poly cotton blend, or make sure you know exactly which fields those crops your eating are grown in; otherwise we'll be debating this in the same place for eternity.
Here's some fun reading as well
http://www.wouldjesusdiscriminate.com/
As to the issue of not knowing any gay people in school, I can assure you, you did. Unfortunately it may not have been a matter of them coming out later in life, fact is that gay/lesbian teenagers have the highest rate of suicide. A very good friend of mine killed himself because he couldn't reconcile it. He was a football player, honor student, and Eagle scout. In his suicide note he stated and I quote, "It hurts to much to go on. I know that suicide is a sin, but so is being gay". That statement will forever be blazened in my mind. His parents were more disturbed by that than the fact that their only child was gay.
As to the issue of PDA's, get over it. Me and my other half aren't going to neck in the amphitheatre at Seaside, but I might just hold his hand. If your child says something explain it. Believe it or not most children will take something as simple as sometimes a man and a man or a woman and a woman fall in love. 99% of the time it stops there, some people seem to think that a child still in the age range to believe in the stork suddenly wants to know about sex. It generally also means that they have just been given the most tolerant and accepting statement a child could ever hear in regards to this issue. It's not going to get them excited about trying it or thinking about it. If it does, guess what, you've got a gay/lesbian child.
To the issue of family can only be a mother, father, and children. Phooey. I have plenty of friends that I consider family. In addition there is no evidence that having gay parents leads children to become gay. In fact they generally turn out straight. I happen to know several gay couples with children and most are grown and straight. They are perfectly normal, functional, contributing members of society. Should we start a list of folks who had two heterosexual parents that didn't really turn out all that great, that's gonna be lengthy and I'm pretty sure that this board has a word limit per post.
Ash, you seem like a very level headed guy, but get over the theory that every gay man is checking you out. If they are take the drink and compliment and politely explain that your not gay. Oh, let me know if this scenario ever actually happens. ;-)
While I continue to find it fascinating how individual children respond to and learn from both a mom and a dad, that's not to say that there are not other successful family models. In the lesbian couple I know, one of the women is CLEARLY "the dad." It is actually pretty funny. 
