the world can't seem to produce enough people as it is!
I think you have that mixed up, the world is producing to many people. In a span of 50-100+ years the world will be over populated.

Gay and lesbians eventually want a family...now how does this get satisfied?
They break up the "male female unit", and take their children!
This isn't fully true. What about adoption? And when a male or female decides to help out the gay/lez couple, it still involves a male and female. The child is still blood related to one of the gay/lez people. You need more convincing reasons then this if you want to make an argument about homo families.

Priests should abstain from fucking guys up the ass, that territory's for the girls.
Personally I see anal are a gay mans sex method. I will not preform anal because if I wanted to fuck someone in the ass then why not fuck a guy. Nope sorry. Pussys only.