Does the gnostic faith support homosexuality?

No. Gnosticism supports the belief in the natural polarity(sex) of the universe, visible in almost all of nature. Positive/Negative...Male/Female. Homosexuality, from the Gnostic view, inclines man towards an animal existence. Man and woman are meant to reascend up the highest state of existence..the opposite of descending into animal world. This is not possible without the male/female sexual connection.