If God has omniscience then how come he made people a homosexual?

The problem is you presume people are born homosexual. This is a lie forced by a group of people. Yes some connections in the brain might make some people more prone to become homosexual, but that does not mean they are born this way. Homosexuality appeared as a result of misused free will as all other sins. About current "science" it is highly manipulated by certain groups with the main agenda to impose the dictature of the AntiChrist and the separation of all people from God.