For myself, as a revert if asked these questions I would answer as follows:
"How do you feel about homosexuals?
I am neutral towards this. If they were one of my Brothers and Sisters in Islam I would encourage them to resist these temptations for it is considered unlawful in the eyes of God.
What would you do if your brother/sister became homosexual?
If you mean my biological brother or sister? It would be much the same as above, I would encourage them not to give in to these urges. If they are Muslim then I would tell them much the same thing as I would any other Muslim who feels attraction to the same sex.
Do you believe homosexuals should be killed?
Simple answer, No. For more details I would say if within an Islamic state being caught in a homosexual act is a crime and punishable according to Islamic law. If the homosexual in question fights against his or her urges and does his or her best to live according to the Qur'an, Sunnah and Hadith then they should be treated like anybody else. If they are out right fornicating with the same sex and caught doing it, then they are breaking the law, just as a man and woman doing the same outside of marriage would be breaking the law.
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I have always been very open minded about the lifestyles of others, long before I learned and embraced Islam. Homosexuality has always been a controversial subject when it comes to religions, not just Islam. In fact I don't know of any religion that openly accepts gay/bisexual/lesbian/transsexuals etc. Nor do I feel this is a disease or a lifestyle picked up due to peer pressure. Some certainly can be, but its a very complex subject. I personally don't feel these people should be prosecuted or tormented in an unfair manner. I do feel they should be modest and keep their activities private as I feel regular heterosexual people should. Islamic law prevents them from engaging in homosexual activities, or marrying so what they do with this limitation as Muslims is up to them and their personal imaan. Allah knows best on what to do with them in the hereafter.
Outside of Islam, I always felt whatever people do, as long as its legal age and consensual its their business. If its against the law then they are breaking the law and if caught must face the consequences.
Earlier somebody mentioned issues people may bring up regarding the marriage between Aisha and the Prophet (salallahu asayliwasalm). If that were to happen in this day and age, it would be considered illegal. Back then, it wasn't out of the ordinary. he may have married her younger than average back then but I am pretty sure (or at least its the impression I have gained from reading the book about the Prophet(salallahu asayliwasalm) by Martin Lings I believe it was) he didn't consummate it till she was older. Either way, all around the world during that time up to probably the 18th century, in most countries, women were married by the age of 12, sometimes earlier. Of course today's standards, it is illegal in most countries, though 14 is still permissible. (in Canada 14 is the legal age of consent. Morally, 18 is more accepted)