The word worship and God is just what we value or exalt or respect or love the greatest compared to other things. Atheists replace God as in the Creator with other things they value and love.
It's impossible there being an Atheist unless you believe there is no value to the universe or a person chooses not to value anything.
Exalted beings - the chosen ones - nothing should be loved and valued on par with them, God of course is the highest exalted being who exalted ones cannot compare to and hence are not gods, but if we don't exalt the chosen ones, we tend to idolize others and not even have a way to God and truth.
And so really Atheists are ACreator(s). They are without belief in a Creator to the universe.
However, they worship other things they hold dear depending on their characters and if they are good, they aren't selfish but value all humans equally as rational and reasoning is against selfishness which is irrational to believe you are to be valued more then others. However in that case, they are more worshiping humans as a race in general or if they love animals as much, then animals included.
God is the Greatest being that all life stems from him and doesn't add to the amount of life there is. Loving God and not loving his creation is oxymoron and deceptive, who knows God loves his neighbor as themselves.