A feast for the eyes, but not much else.
I don't . . . see this. Your interpretation is about opposite of mine. Maybe it's a Latter-day Saint thing? Eric Samuelson was one of the first I read talking about it as a spiritual work: http://associationmormonletters.org/blog/2011/12/the-tree-of-life/
To me, the film explicitly argues for the existence of God—or at least for the validity of looking for God. As do the other Malick films I've seen (which is not a large number of them). I think of the conversation between Malick and Scorcese.
My own thoughts are linked to here: https://thmazing.blogspot.com/2020/01/best-films-of-10s.html
But I haven't written anything truly coherent.
I might not have bothered if I didn't usually find you so persuasive!