You asked
Tell me, do you think as a Christian, should I accept gay marriage or not?
You also mentioned that you have been praying about this, but God hasn't answered you.
I think God has answered you. He's led you to start questioning your position. I've always believed that God doesn't respond directly to us, but enables us to deal with the problems we face, rather than removing the problems for us.
To give you an example, when i was studying for my Honours Finals, I wasn't working hard enough because I couldn't be bothered. I knew I faced failing my exams and, lazily, prayed for God to help me pass my exams.
Now, God could have just popped all the info I needed into my head and ensured that easy questions came up, but that would mean I passed without deserving to pass. Instead, what I found was that studying became easier, I didn't get distracted, I started wanting to study and even enjoyed it. The amount of work I put in was enormous, more than I'd ever managed to do. There was never any sense of God having a hand in this, yet I was changed in my opinion of studying and this enabled me to put in the effort required to pass my exams.
I honestly believe that we have all the information we need to decide how we should respond to people who are "different" from us. All of the teachings of Jesus taught us to love one another and to do unto others as they would have them do unto us. We're also taught that God doesn't want us to judge others. So who are we to believe that gay marriage is "wrong"?
Also, consider this. Suppose that being gay is due to a developmental "abnormality" in certain parts of the brain, due to environmental, genetic or hormonal factors. This would mean that a person has no control over whether they are gay or not. Other conditions which are thought to have a similar combination of causes include clubfoot. Now, how would God react if you end up standing in front of Him and He asks you why you objected to clubfoot marriages?
We don't know for sure why some people are gay. There is some evidence that it is physical, not psychological (ie it isn't a choice you can make, but the way you are born). Given that we don't have definitive evidence of the cause, should we condemn gay people? Or should we give them the benefit of the doubt? What if it turns out that it is due to physical causes? Would you have a leg to stand on when you finally get to God and He asks why you behaved the way you did towards gay people who could no more help the way they were born than people with clubfoot can help it?
If there is the slightest chance that the cause of homosexuality is physical, then that is doubt enough for me to say "This isn't for me to judge, this is for God to judge."
To be perfectly honest, even if it were demonstrated to me that homosexuality was a lifestyle choice (and I don't for a minute believe that it is), I would still refuse to judge and leave it to God. I'm not convinced that it matters to God, since the Ten Commandments say nothing about it. They condemn covetousness, adultery, theft, lying, yet no mention of homosexuality.
I hope this rambling response help you in some way to your final decision. The decision is yours to make, God will not make it for you, but He will help you in vague ways to reach it. I think He's already started helping you and I'll pray that He continues to help you until you get to where He wants you to be.
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