Lord Krunk said:
Everything's Nurture, unless it's something hereditary.
Seriously, you weren't born gay or straight, you weren't born Christian or Athiest, and you weren't born with ideals right off the bat. It's the way you were raised and the environment around you that creates you, as a person.
I'd disagree with that. Whilst the environment is a huge factor in anything to do with psychology/the phenotype genetics has a huge role to play. Mental disorders such as depression, bi-polar and schizophrenia have all been shown to have genetic links as well as environmental causes - there is nothing to say that being gay doesn't also have something to do with genetics (whether it causes expression of different proteins in the brain or different concentrations of neurotransmitters or whatever)
Religion is more placed upon a child by the parents - but even that has a genetic cause. Studies have shown that women are more likely to attend religious services than men - a trend which holds true across all cultures and religions. That is a case of something which is obivously partly genetics and partly environmental.
My point is the phenotype is a complex mixture of genetics and the environment - saying it it just one misses the whole picture.