It should not even be called spirituality ... just how to find our full potential. The word spirituality has a very bad history ... people fought wars over who is right/wrong.
In a pure logical world nihilism would be one potential answer.
'full potential ' would mean something different than in a pure life positive mindset.
I would go so far to say that reaching the stars is secondary as long as others still suffer in their existense.
Spirituality starts for me were your thoughts don't have a logical root.
What's 'full potential'? Why is it relevant. Why would it be better than not being born?