But I thought the Bible said that homosexuality is a sin?

Lesbians, gay men and today transgendered persons face discrimination because of societal attitudes.

 
Unfortunately, these attitudes are often taught by the church. Sadly, the Bible is often used as a weapon to "bash" those that are different.  It is important to remember that such hurtful things are not a reflection of Christ, or the way God wants the church to be, or even what the Bible really says. They are the products of the fallible and imperfect human beings who guide these churches.
Ultimately, a Christian's personal faith should not depend upon a particular church or clergyperson, but rather it should be solidly placed in Jesus Christ. In addition to the biased teachings of certain ministers, Scripture sometimes presents a stumbling block for people who are both homosexual and Christian or transgendered and Christian. . 
Thoughtful Bible study reveals that the Bible does have Good News and it does not say what you may have thought it did about homosexuals!
For more information on this subject, visit the UFMCC website and select "The Bible". Then you may download or read on line the following brochures.
 
The Bible and Homosexuality Rev. Dr. Mona West

Homosexuality: Not A Sin...Not A Sickness Rev. Elder Donald Eastman.