(Why is homosexuality a "sin"?
I have never understood how loving someone is a sin JUST because they are the same sex as you... Why would "god" put homosexuals on this planet if he was just planning on sending them to hell anyways?)

Homosexuality a sin of abomination (at least in many religions anyway). Love and lust, there is a difference. Love is unconditional, lust is . . . well covetousness. Just because there are homosexuals doesn't mean God put them there. God didn't 'put' sin in this world, but merely allowed sin's existance so we could see the consequences of sin--pain, suffering, death, sickness, etc. God wasn't planning on sending anyone to hell. However, there is a point where people become unrepentant and must go to hell, and where that particular line is drawn is determined by God.