Saying “religion is the problem” when the problem crops up in many different areas regardless of which religions are present in an area or if religion isn’t present at all makes it seem like you might be focusing on the wrong thing. Nationalism, religion, strong ideologies, groups with deep emotional bonds and a sense of insularity are all susceptible to the same things - charismatic leaders can easily direct their attention and they have a tendency towards directing their hostility towards groups that don’t fit into their group.
So, tribalism. And if one tool won’t work, or is removed completely from access, those who wish to use tribalism to mobilize a large group to help them achieve their goals will just use the next one that is available to them. The tools are rarely what are important to them, but the results. So I don’t see how focusing on one tool, even a particularly well-suited tool, will solve the problem.