Every child need a mom and a dad to be born. It is a natural process. Our Creator, made it this way then who are we to disagree with His wisdom.
Homosexual relationships are forbidden, a sin. Homosexuality is a kind of abnormality, something that should be kept under the wraps.
The gays and lesbians, both go against the natural disposition (fitrah) which Allah has created in mankind – and also in animals – whereby the male is inclined towards the female, and vice versa.
Whoever goes against that, goes against the natural disposition of mankind. And that is not alright. A sin remains a sin no matter how modernize things get. Hence, one should neither participate in nor support homosexuality.
Note this: I am not saying that they (gays and lesbians) should be deprived of the human rights, just that, this abnormality should not be acted upon or promoted.