Resource by Matt Slick from Christian Apologetics & Research Ministry at http://www.carm.org (Joshua highly recommends)
There are those who like to say that the Bible does not condemn homosexuality. Various verses are cited (out of context) and the verses that people use to show that homosexuality is wrong are explained away. The world wants to change God's words and meanings into something more suitable to its sinful desires. Nevertheless, the truth stands: The Bible condemns the act of homosexuality as a sin. Let's look at what it says.
Lev. 18:22, "You shall not lie with a male as one lies with a female; it is an abomination."
Lev. 20:13, "If there is a man who lies with a male as those who lie with a woman, both of them have committed a detestable act; they shall surely be put to death. Their bloodguiltness is upon them"
1 Cor. 6:9-10, "Or do you not know that the unrighteous shall not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals, nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers, shall inherit the kingdom of God."
Rom. 1:26-28, "For this reason God gave them over to degrading passions; for their women exchanged the natural function for that which is unnatural, 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. And just as they did not see fit to acknowledge God any longer, God gave them over to a depraved mind, to do those things which are not proper."
Added personal note (in italic) to Matt Slick’s answer (without major edit) by Joshua Yong
Notice that every time homosexuality is mention, it is on the sexual act of homosexuality, not the orientation. But like I said before in my previous post, although having homosexual orientation is not wrong, one must not accept it as “natural” as then one will slowly yet surely proceed on to embrace its sinful lifestyle. One need to face the truth that homosexual orientation is not natural thus needs to seek help before it leads to homosexual behavior.
The act of homosexuality is clearly condemned by the Bible. It goes against the created order of God. God creates man and woman to build a family and the result of families is human community. Thus if the act of homosexuality is allowed, it is against the purpose of God to create human community. As homosexuality defeats the purpose of procreation, family and human community, it has no place in God’s created order for human community. Therefore, how can homosexual behavior and lifestyle be right for human community when procreation is concern?
Originally, He created Adam and then made a woman. This is what God has ordained and it is what is right. Unlike other sins, homosexuality has a severe judgment administered by God Himself. This judgment is simple: They are given over to their passions. That means that their hearts are allowed to be hardened by their sins (Romans 1:18ff). As a result, they can no longer see the error of what they are doing. Without an awareness of their sinfulness, there will be no repentance and trusting in Jesus. Without Jesus, they will have no forgiveness. Without forgiveness, there is no salvation.
What Should Be The Christian's Response to The Homosexuals?
Added personal note (in italic) to Matt Slick’s answer (without major edit) by Joshua Yong
Just because someone is a homosexual does not mean that we cannot love them or pray for them. Homosexuality is a sin and like any other sin, it needs to be dealt with in the only way possible. It needs to be laid at the cross, repented of, and never done again. The world today reason and justify homosexual lifestyle as a human right of choice but human right only means freedom to do what we ought to do, not freedom to do as we like. Or else everyone can play God and justify every action as “right”…then where are justice, order and truth? Never dilute God’s original design and purpose or we will be lost and have nothing left to stand on, everything will be relative where truth can be created and recreated. Such a world is chaotic and fragmented without order. When the world disobeys God, don’t blame Him for the world’s suffering.
As a Christian, you should pray for the salvation of the homosexual the same you would any other person in sin. The homosexuals are still made in the image of God -- even though they are in grave sin. Therefore, you should show them the same dignity as anyone else you come in contact with. However, this does not mean that you are to approve of their sin. Don't compromise your witness for a socially acceptable opinion that is void of godliness.
What the world accepts does not mean it is right. Homosexuality is more of a psychological “confusion” than biological. Most are not born with it (there is a lack of scientific medical proof that homosexual orientation is solely caused by genetic and hormones) but it is mostly developed through time in an environment that lead one to have homosexual orientation. It is a common trait that homosexuals are from broken homes without the normal support of a family (lack or over influenced by only one gender from father, mother or relatives since young apart from abuse cases) and some tend to be lonely thus seeking love and attention from another. Some are usually hurting and lonely inside until they find “joy” in another person to “fulfill” their homosexual orientation. I shall not comment further and go into details with each scenario on this issue as it needs to be done comprehensively to be fair and whole but this section isn’t about homosexuality but about how Christians should treat them.
In a nutshell, accept the person but reject the sinful lifestyle. Understand and hear them out but it does not mean you need to embrace their ways no matter how reasonable it may sound. Everyone has reasons for their actions but it does not make it acceptable, right? (Some steal to get food but it does not make stealing acceptable, the problem of hunger needs to be solved but stealing isn’t the way, same goes to homosexuality. Having homosexual orientation is not a sin, practicing homosexual lifestyle due to the orientation is. Just like having a hot tempered personality is not a sin, refusing to change and express out the angered temper is a sin. Same goes to homosexuality, it needs to be dealt with and not succumb to it). Get to know them as a person, not as homosexuals and lead them to the Truth with love which sets them free for greater joy, love and peace. It is what they are seeking for anyway. See them as Jesus sees them, not with prejudice, biasness or stereotyping. They are genuine people, not a different species or type of people.
Understand their struggles and help them see their problem (yes, it is a problem) rather than allowing them to live in a confusing lifestyle. Help them face the truth rather than accepting their lifestyle as normal or the “liberal lifestyle of today”… It only brings more hurt than happiness in the long run although homosexuals, like any other persons, experience love and happiness in a relationship. Yet again, it does not justify it as “normal/natural” or right, not only before God, but before the design of our biological body and social order (family and community-these can’t exist if homosexuality is meant to be).