It is the god who initiatiated his promise & rewards to abraham not the other way around.So in core of every religious practitioner lies a personal motive that investment in almighty will attract great rewards ..I don't see any moral high ground for a religious guy over athiest as athiest is helping themselves without depending on God ..
It is only natural to reap a reward from the almighty in this case an immortal body to be with god in his kingdom in the future on the earth.
To reap that reward however requires training in righteousness & denying self & conform to god's law.
man by natural self cannot attain the high moral ground.
It is absolutely fine atheists dont depend on god as he would not force anyone to do so.
They simply live a life, die & vanish forever.