I'm not going to act like that I know what the motives were nor do I claim to know what they were. However I do have a theory or 2 as to what they were. I'll give the facts first (at least what was said). From the sound of it, the guy was an oddball (for a lack of a better term) when he was a teen. According to people that knew him, the guy preached (their word, not mine) atheism. They said he was always a bit off, but nothing too out of the ordinary (at least based on what we heard so far). He joined up with military (can't remember if it's either Navy or Air Force), and served 4 years. The guy was dishonorably discharged and was court marshaled after allegations came out that he was beating his wife and kid. Supposedly, the family he was married to attended that church and he was a Vacation Bible School aid, but it's weird because he was an atheist, supposedly (maybe a convert, but nothing has been confirmed yet on that). Then the day of the shooting happens, and we already know what happened from there, other than if he shot himself or bled out after the guy who shot him.
A few things: What was an atheist working at a church to begin with? Again, maybe he was a convert or was converting, but typically atheists don't attend church, let alone work at them, unless if they were giving their life to Christ. I'm wondering if maybe he was a disgruntled atheist and wanted to shoot Christians because he believed they're evil, mean, bigoted, or whatever else was negative he believed about us. The other thing I'm wondering about was maybe he wanted to kill his own family members. Another theory is it was driven because of political reasons. The other day, Rand Paul's neighbor attacked, breaking a few ribs, and I believe was confirmed that he did what he did because he didn't like Paul's politics. Also, we have the shooting at the baseball field several months ago with the guy that wanted to kill Republicans. And there was a stabbing on a train that was also politically motivated, by a Crazy Bernie guy. Don't forget Antifa. Same deal there, except no deaths (yet) but still commit violence against those they disagree with. All of these people that law enforcement has looked into and confirmed were all Democrats, or at least voted for Democrat. I'm wondering if we have the same case here, and, typically, people that attend church are conservative. The shooter might have been a Leftist, and made the decision on that alone to kill those people in church.
The bottom line is this was an act of terrorism. Many on the Left are already calling for gun control, but there will be one of 2 ways the media will try to spin this and make Christians look bad: First, we'd find out the guy did indeed convert and the media will try to show that that's how Christians are (violent). Or the second, the guy was an atheist and the Christians at this church treated him unfairly, were mean to him, made fun of him, and said he was going to Hell because atheists can never be forgiven. This is what the media will want you to believe. Either way, Christians will be made into the bad guys in the story because the media is very anti-faith and anti-religion (unless it's Islam, the "religion of peace"). Other than that, the motives will probably be revealed much faster than the Vegas shooter's (which is yet to even be revealed) because I couldn't imagine Texas law enforcement screwing around on a case like this (when lives are involved). But, you never know if they'll drop the ball on this, and I hope they don't.