In less that one billion more years our sun will turn into a red giant. All life on earth will be burnt to a crisp. Other cosmic processes absolutely guarantee the extinction of all life anywhere in the universe. When all life is extinguished, no memory whatsoever will be left that life ever existed. Yet our lives are filled with meaning.
Proximate meaning is more important than ultimate.
Even if we die, we can have deeply meaningful lives. Meaning in life is shared. We cannot have even proximate meaning except in the context of culture. This is true for religious people as for agnostics or atheists. No group can cut out the others.