Assuming you know what is going on in my head, heart and gut is a huge slap in the face to someone who has spent my entire life reconciling my sexuality and my faith. As someone who has been influenced by a number of faith traditions (growing up the pastor's son at America's largest Lutheran campus ministry, living among Baptists for four years in Memphis, and having worked for two Methodist, two Presbyterian, two Episcopal and one Catholic church) I believe that a faith in Christ is one discovered through study of the Scriptures, along with a prayerful, "personal relationship with Christ" (the quoted section being learned largely from the Baptist/Evangelical tradition). I also believe that one's life experience is crucial. As someone who has first-hand experience with being gay, I can attest that I did not choose it, and from that background, along with a scriptural and prayerful relationship with Christ, I have come to the understanding that being gay is not a sin.
The best thing that someone can do to know about being a gay Christian is to actually listen to one. Mikah Meyer explains that well in this Huffington Post essay.