I think you are wrong in evaluating religion, in my opinion it is not religion that spreads war but the rulers or the government in order to achieve their interests. whereas in the matter of religion, I think people are free to choose religion, they do not have to follow the religion of their parentst
Religion refers to the beliefs and a series of practical and moral instructions that the prophets have related on behalf of God to guide and lead human beings. It points to the recognition of one controlling power, God, who, as the sole creator, guides human life towards its ultimate perfection by adopting a set of principles and by obedience of specific code of practical ethics.