The Devil just keeps on doing his work, and that is for 24 hours a day. It doesn’t matter if a person is gay, muslim, atheist, etc. If you don’t agree, there is the polemic platform: have a debate. Let each side present their evidence and allow the listeners to conclude who has the truth. But, what one must not do is get a gun, walk into a place, and open fire. No one has the right to do that.
The Bible teaches that murder is murder, and that is all there is to it (Romans 13:9-10). Such a sin will condemn a person to hell. That guy in Orlando might think he is headed for paradise after shooting up that night club, but such will not be the case for him, nor any other foolish person who decides to follow in his footsteps (Matthew 15:13-14).
A person cannot win the approval of God by shooting and killing others simply they don’t agree with them. All shooters will be hell bound if they die in the gun battle with police (John 8:21).