I think that the notion that educating children about the existence of homosexuality will somehow influence their orientation is misinformed, to say the least. Experimentation with same-sex relationships is part of maturing into a healthy sexual identity, be that identity be hetero or homosexual. Regardless of whether the issue is raised in the classroom or not, children and teenagers are going to learn about it anyway, and most will experience it themselves. Anyone who has ever been from a boys or girls school can testify to that.
With regards to the Christianity statement, I'd just like to point out that the aggressive Christians are not representative of the greater Christian body. Most Christians might morally disagree with homosexuality but are perfectly fine with living and letting live, and definitely get along well with homosexuals in general.
As a Christian myself, I refuse to accept that an obscure verse in Romans is more definitive of Christianity that the Sermon On The Mount. Every faith is built upon the principles of love and brotherhood, and when complications start to blur the key precepts of a faith is when the believer loses focus and becomes an extremist. In a multi-cultural society like ours, faith and belief must be tempered with good sense and love for your fellow man. If not, faith becomes mere religion.