Seven Reasons Why Homosexuality is Wrong

1. Homosexuality isn't genetic or biologically determined.  There is no gay gene or biological cause for same-sex attraction.

2. The only evidence for homosexuality is social factors. Social influences are key in developing same-sex attractions

3. It opposes the natural function of the body. Male and female bodies have anatomical fit and compliment each other. The reproductive organs work together to produce a human child. This is a clear indicator that natural design is heterosexual.

4. Romans 1:26-27 states that homosexual behavior is a rejection of God's sexual design.

5. Those advocating that the Bible doesn't condemn homosexuality must distort and misinterpret the clear meaning of Bible texts.

6. Some contend that since homosexuality occurs in nature it is morally acceptable. But if that were true every behavior would pass as moral. 
Theft, murder, lying, rape all occur frequently in nature. Some animals eat their mates, some abandon their weak or disabled family members.

7. Often morality is the opposite of what is natural. Morality is often overcoming our fleshly selfish desires and impulses.
Morality is what separates humans from animals.

If you were taught to think you evolved from animals you might believe immoral activities are natural.

Loving someone of the same sex does occur. Just as David and Jonathan loved one another, but sexual relations are condemned as immoral.
  
We are to take control of our emotions rather than be subject to them. That's why adultery, covetousness, fornication, stealing, murder are condemned as sinful.