1) Homosexuality is unnatural.
Then why has homosexuality been observed in thousands of species of animals? Why are there physical differences in the brain structure of heterosexual and homosexual people? Why is there a difference in hypothalamic structure between heterosexual and homosexual men? Why is it that, in homosexual men, neurons in the INAH3 are packed more closely together than in heterosexual men? Why do connections in the amygdalas of homosexual men resemble those of heterosexual women? Why do connections in the amygdala of homosexual women resemble those of heterosexual men? Did you know that the tiny inaudible sounds our ears make are different for lesbian ears than heterosexual ears? Did you know that there are physical differences in the brain structure of heterosexual and homosexual people? Did you know that gay men have a detestably different scent/body odor in their sweat than straight men in double-blind studies? What about the piling evidence that supports the gay gene and that children are born gay? If homosexuality is, in fact, "unnatural" then why are many unnatural things viewed as "good" and many "natural" things viewed as "bad"? Do you view homosexuality as a disease that can be "cured"?
2) Homosexual couples cannot have children.
Why isn't reproduction a criteria for people being allowed to get married? Why are children not a necessary component of marriage? What about infertile heterosexual couples? Should heterosexual couples not be able to get married on the basis that they are unable to produce children? What about couples who do not even want children? Should couples not be able to get married on the basis that they do not want children? What about homosexual couples who use surrogates or become surrogates themselves? What about homosexual couples who use invitro fertilization? What about homosexual women who are impregnated by their rapist?
3) Marriage has traditionally been between a man and a woman.
If this is true, why was it not unheard of for people to marry more than one spouse hundreds of years ago? Why was polygamy common thousands and even hundreds of years ago? Wasn't marriage originally a contract between the couples and the state? Hasn't marriage evolved over the past thousands of years? Why say that there was anything "traditional" about marriage when that is historically untrue? Did you know that, "traditionally," men were given more rights? Would you rather go back to a time where women had barely any rights to money, property or their own children during or after a marriage?
4) Religion.
Isn't the proper, historical and religious term for religious marriages called "wedlock"? Wasn't the word "marriage" NOT coined by religion? Weren't there polygamous relationships in the bible? Don't people who aren't religiously affiliated able to get married? What does a persons religion have anything to do with marriage as a whole? What does another persons marriage or reasons for getting marriage have anything to do with you? If the bible is not a legal document, and it marriage was not coined by religion, then why should everyone adhere to those religious beliefs? Why should a secular society conform to your beliefs when they have no meaningful basis in a non-Catholic/Christian world?
5) Homosexual relationships are harmful to children.
How exactly are they more harmful? Would you rather a child go to a mental institution than to go to a family where they will be loved and cared for and raised by two men or two women? Would you go up to a child who is facing imminent institutionalization, and tell her that that's nothing compared to having two mothers or fathers? Who cares if they shave her head, if she'll never have a family, if she'll lose her smile and her chance at a normal childhood? At least she won't have gay parents, right? If you can't pinpoint anything harmful or abusive, then on what basis do you have to call those relationships harmful or abusive? If you can't explain anything outside the context of your faith, why should the rest of us take you seriously and listen to what you have to say when it comes to our own lifestyle and policy decisions?
