Even simple Logic defeats their theology.
You can conclude this whether you believe in God or not, because of the evidence in the world around us.
A rudimentary study of genetics reveals that the maximum shuffling happens when DNA/RNA reproduction takes place. The resulting logic? Diversity is the name of the game. In the natural world, every ecological niche is filled by one species or another, further support for diversity. If for the sake of argument, you admit there is a creator, why would he design diversity into his creation but insist on a strictly held narrow exclusive religion in his believers, it does not make sense, because nature abhors a clone.
If you similarly admit that God is a father figure and Man is made in his image, where do you get the justification from to decide which of your "brothers and sisters" (His children) lives and who dies?
If anything is likely to make "God" angry, then it not going to be Yazedis, Alawites, Sunnis, Shia, Christians, Jews, Hindus, Buddhists, etc, etc. It is someone thinking they have the right to destroy his creation and children and to compound this by saying they are doing it in His Name.
No, I don't think these cowards are on the fast track to heaven, I think they may well find themselves in the outer darkness and the place of gnashing of teeth.
DaveP