Proposition of value is what counts here. Judge it by its results. Circumscription of the topic Many kinds of religious sentiment, hence confusion as to its nature. Institutional religion vs personal religion. James chooses to cover only personal religion.
Religion is a concern with primal truth.
Religion is equally hostile to heavy grumbling and complaint. I accept the universe. Hence, need to surrender, and trust the divine. Sense of relief. This sense of happiness in the absolute and everlasting is what we find nowhere but in religion.