Atheism makes the assumption there is no God (read creator).
No, atheism makes no initial assumptions, and through reason and experimentation comes to the conclusion there is most likely (to a high degree of certainty) no God, at least not as defined by most religions.
Now, your final two sentences...
Both make assumptions. Both have the possibility of being incorrect.
...do not imply the third from last:
There is no difference between the two.
There are many other sorts of differences beyond assumptions and possible incorrectness. From a rational perspective, the evidence supporting one is much more rigorous (i.e. evidence has a higher prior probability and more supporting data to raise posterior probability).
You could assume that if I turn the key in my car's ignition it will start. I could assume that it won't. Both have the possibility of being incorrect. However, one of us has actually tested this, so one of us has better information.
No, atheism makes no initial assumptions, and through reason and experimentation comes to the conclusion there is most likely (to a high degree of certainty) no God, at least not as defined by most religions.
Now, your final two sentences...
Both make assumptions. Both have the possibility of being incorrect.
...do not imply the third from last:
There is no difference between the two.
There are many other sorts of differences beyond assumptions and possible incorrectness. From a rational perspective, the evidence supporting one is much more rigorous (i.e. evidence has a higher prior probability and more supporting data to raise posterior probability).
You could assume that if I turn the key in my car's ignition it will start. I could assume that it won't. Both have the possibility of being incorrect. However, one of us has actually tested this, so one of us has better information.