I'm so sorry. I believe it's shocking for you. Your wife needs to get professional help, but she won't do it unless she knows that homosexuality is wrong, it's not how God created us or want us to be. If she doesn't realize this, I'm not sure there's anyway to keep her with you.
Actually, if you really think about it, it IS how God created them, and he did so for a reason. While it is true that God gives us the freedom of choice, it is also true that God has a master plan. Biblically speaking, you know we are coming closer to the end times when we see certain events taking place. Nation against nation, abominations of sin, etc etc. Just as Judas' purpose was to betray Christ, so it is with homosexuality. You cant have good without evil - they both must be present in order to work.
I don't believe that God would create anybody homosexual then condemn homosexuality.