Many people misrepresent Strong Atheism or even Atheism as being an absolutely certain belief that there is no God, although I have never seen any reputable source use such a definition.
Under the standard definition of Strong Atheism it includes any belief that there is no God, however tentative. My own position, that there are strong
a priori reasons to consider a God unlikely to exist and no good evidence that one does exist and that therefore I take the tentative and revisable view that there is no God would seem to be both rational and a form of Strong Atheism.