I am still waiting on someone to explain to me any GOOD reason why they should not be allowed. With the separation of church of state Leviticus should not be considered.
These are the excuses I've seen used:
#1 It will destroy the sanctity of marriage if gay marriage is legalized.
We live in a world where the divorce rate is extrememly high. I've seen 50% in some cases, but even if it's low like 40% that is still high. We've seen celebrities get married and divorced constantly, we have seen marriages that are unhealthy. And non of it has to do with gay marriage.
#2 My religion is against it.
Fine, don't marry someone of the same sex. The simple fact is there are many LEGAL things in the U.S. that go against Christian values. That is no reason to vote against something just because of your religion. The fact something is legal does not mean it's morally right.
#3 It will lead to beastiality and pedophiles can marry children.
This one is beyond stupid and shouldn't even need to be debated. If someone can't see the difference between f*****g an animal or child and a legal consenting adult, there's no hope to get them to understand.
#4 Marriage is between a man and a woman
Marriage used to be defined differently to 1 man 1 woman of the same race, same noblity, etc. Marriage can easily be changed to between two people.
#5 Gay marriage will lead to polygamy.
I don't think it will, but even if it did. I have no problem with polygamy. The main issue with polygamy would be administrative more than anything. Forms, what to do when someone dies, divorce, etc.
Anyway, those are the main ones I've heard and all of them do not justify keeping gay marriage illegal.