I got plenty o' nuttin'
Special hat-tip goes to The Digital Cuttlefish for clearly articulating a lack of belief.
An absence of belief is just that--an absence. Zero on the scale. You don't get more zero by adding exclamation points, or more zeroes after a decimal. You may have positive beliefs that are relevant--I, for instance, believe that an understanding of the psychology and neurology of belief more than adequately accounts for the reasons people believe in a god, without an actual god being required at all--but this is a separate positive belief, not a "stronger absence of belief".
Stronger and weaker are terms that are appropriate when speaking positively of a belief, but irrelevant when speaking of an absence; to use the terms is to strengthen the anti-atheist position that speaks of "atheist agenda". Catholics may have an agenda, but non-catholics? Muslims may have an agenda, but non-muslims? (note--I am not using "agenda" to mean anything other than their defining beliefs.) "None of the above" does not have an agenda.
While it's obvious that some atheists have their own additional political agenda e.g. antitheism, the atheist position has no agenda and is not something that can be weak or strong. I got nuttin'.