Homosexuality is clearly condemned in the Bible. It undermines God's created order when He made Adam and Eve, a man and a woman, to carry out His command to fill and subdue the earth (Genesis 1:28). Homosexuality cannot carry out that mandate. In addition, homosexuality undermines the basic family unit of husband and wife which is the God-ordained means of procreation. Again, homosexuality cannot do that. And, believe it or not, it is also dangerous to society. (See Is homosexuality dangerous?)
Homosexuality has a heavy judgment administered by God Himself upon those who commit it and support it.
"For this reason God gave them over to degrading passions; for their women exchanged the natural function for that which is unnatural, 27 and in the same way also the men abandoned the natural function of the woman and burned in their desire toward one another, men with men committing indecent acts and receiving in their own persons the due penalty of their error," (Romans 1:26-27).