Exploring the Closet

There are two major cultural issues being debated in the US at this time: homosexual marriage and immigration. Starting next week, I want to begin exploring the issue of homosexuality and homosexual marriage.
My intention is to discuss at least the following topics:
Categories of sexual orientation
The causes of homosexuality
Homosexuality and Darwinism
Cultural history of homosexuality
Homosexuality and the Bible
Homosexuality as sin
Marriage versus Civil Unions
I had hoped to have a blogging discussion with a friend who teaches at a college and promotes homosexuality and bi-sexuality. However, I could not get a response from my friend and so I have decided to simply begin the discussion anyway.
This will not be a detailed, scientific discussion, but one more general in nature. I intend, however, to be thorough when necessary.
I will go on record now and say that I do believe homosexuality is wrong. However, in my posts (and I expect this as well in the comment areas), I will be respectful and take the mentality of an explorer, asking questions and seeking answers.
I have added a comment policy and a privacy policy. Before you comment, please make sure you read them both. Those will be the guidelines I will follow in the comment area.
I hope this spurs honest discussion and that we can engage people respectfully and lovingly.