You described the complexities better than I ever could. Yes, the rebels are committing heinous crimes too, Alawite sect is an issue for the Sunni Arab Leagues, and then Saudi and Israel along with Russia got involved too. It's a culmination of various issues and not just one.
I think the nastik card is just way overplayed. It's a misleading attempt to simplify the very complex situation. In the end, it is the common Syrians who are paying the price.
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