I was raised with religion and then later realized it doesn't make sense, I went through a lot of the same feelings

You could still have subjective value even if there's no "sea level" from which to assign an absolute value. "Value" is a pretty abstract concept and something everyone probably has to define for themselves, but at least depending on your definition _everything_ could have value - maybe not to you, or maybe not right now, but in some sense it still "ultimately" does - and that's pretty cool too