There's no use in analogising such a complex situation, it utterly fails to capture the situation or the context. You're also welcome to theorise whether or not Israel deliberately sought the deaths of 2000 citizens just to cleanse Gaza but that's a massive claim for someone not privy to classified knowledge.
Oh yes of course banning religion is the obvious answer that will lead to harmony. Even in your magical world where religion doesn't exist this conflict would then be on racial lines.