As a general rule, don't take anything about religion form huffington post seriously, their writers show a level of bias generally reserved for political campaigning.
As to the article, it's a load of bull.
The Bible explicitly condemns homosexual behavior. The number of times it does it is immaterial, it only needs to say it once. It condemns homosexuality as a violation of natural law, which it is; this is also why the condemnation carries through the New Testament, unlike certain others (such as eating pork). Homosexual acts are incapable of producing life, therefore they act against the natural purpose of sexual intercourse, and are considered selfish because they are not unitive, but rather are focused on self-gratification. In essence, they are no better than masturbation.
He goes on to try to construe Paul's words into something they are not. It is explicitly clear that he is referencing homosexual acts; the nature of those acts (consenting or not) is not what makes them disordered, as he tries to claim; it is the act itself that is disordered. He also tries to use wordplay to make unnatural mean "unnatural to heterosexuals." This type of wordplay is very common among homosexualists, because its the only way they can make their lifestyle appear anything close to "natural." Unnatural means exactly what it says, it is against nature. The nature of sexuality is geared towards procreation; hence, sexual acts which are not geared towards procreation are in violation of the natural order and therefore Unnatural (the true meaning of the word).
His fourth point is the most worthless of all. "Jesus didn't talk about it, so that must mean it's ok." To be perfectly honest, this claim is so offensive I find it almost impossible to maintain a level head long enough to reply to it. Christ didn't talk about it because in his time, they though that homosexual acts could ever be considered "natural" was as far out of their minds as the orbit of the Pluto. It was a non-issue; there was no reason for him to talk about it because EVERYONE KNEW IT THROUGH THE EXERCISE OF THEIR MOST BASIC REASONING SKILLS. Christ knew things would come up that he hadn't addressed, which is specifically why he gave us the Church and has the Holy Spirit guide us to the fullness of truth. I hope, with all my heart, that you understand why this is such a bad argument for anything -period.-
Next up, he tries to use OT examples of "alternate marriages" to make it "ok" this is, again, bollox. Abraham's actions (as with most of those he referenced) occurred prior to God giving us the Ten Commandments. He also completely fails to acknowledge the circumstances surrounding any of these examples, which makes his points pretty much meaningless. He also, again, makes the mistake of saying "because Jesus didn't condemn it, we shouldn't either".
...and don't get me started on the comments of that article... people will wear all kinds of blinders when confronted with the Truth; all we can do is pray they open their eyes.
Here is an excellent and brief discourse on the Biblical evidence: Homosexuality