No one actually knows what the global maximum is, or how to get there, outside of any specifics that religion may or may not tell you.

A "global maximum" closely parallels the definition of faith. It's the maximal good for the maximal number of people, and a real destination for some (surely not all are worthy of it, as long as human evil exists). How we get there, what it is, who actually makes it there, on what basis, what's preventing its realization at present, how to overcome such obstacles --- these are the questions that religions (including secular humanism) answer.