Present humans continue in that quest for the sake of themselves and future generations. Atheists do this by feeding the hungry, clothing the naked, improving health, etc. Each person can contribute up to the limit of his or her abilities. We become happy by making other people happy. Atheists reply that if you need religion, and such belief makes you happy, then you have the right to be religious.
Atheists are for total religious liberty.
Of course, true religious freedom involves the right not to believe as well as to believe. Atheists, of course, think that it is far better to believe only what is true, but people have the right to believe in anything, true or false. Well, we want nothing more than to be left alone and to be free from persecution and harassment. We want to be able to publicly say that we are atheists without fear of economic or social retribution. We want to be free to distribute our literature in the same way members of religions distribute theirs.