Which religions are against homosexuality and why?

The Abrahamic religions (Judaism, Christianity & Islam) plus Zoroastrianism and Bahai'ism are generally anti homosexuality (there are exceptions within certain sects), considering it unacceptable in any shape or form. Some Christians, Jews and Muslims may however claim that the desire or inclination towards the same sex is in itself not blameworthy but condemn the physical act carried out between two such people. On the other hand, Buddhism, Hinduism, Jainism, Sikhism and many of the ancient polytheistic and animistic religions are either silent or even tolerant of homosexuality. These belief systems and associated cultures often refer to homosexuals under the categories of 'third gender', 'natural eunuchs' or 'double spirit' people.