I never said that the definition for "atheist" was the same as for "strong atheist". "Atheism" only requires a lack of belief, but "strong atheism" requires an active believe that God does not exist. Why would that be a problem? They are different terms with different meanings. Atheism merely includes "strong" atheism. Linguistically, this makes sense.
My concern is that if the definition of "atheism" is changed to be identical with "strong atheism", the term "weak atheism" will be cast aside. Linguistically, "weak atheism" has to be included in the definition of "atheism", or else it cannot be identified as "weak atheism". I think that most atheists are "weak atheists", some of the most vocal are in fact (at least they profess to not have an active belief that God does not exist), so they would no longer be considered as "atheist".
I think it is important to know for theists that most atheists are weak atheists, in that they merely lack a belief in God. But, they don't believe that the existence of God is impossible.
When was the term "weak atheist" coined? Why is it a necessary term? If it is important for theists to distinguish this group of people, why put them under the umbrella af "atheism" at all? Why associate people who are unsure and people to whom belief is inapplicable with atheism? Why associate agnostics with atheists? Why associate rocks and babies with atheism?
The reason that people often give is that all of these people share a characteristic in that the do not hold a belief in God/gods. Now, it is fine to categorize things and people based on similar characteristics. But there is no reason for the choice of the characteristics of holding a belief that God /gods exist and not holding a belief that god/gods exist vs. Holding a belief that god/gods does/do not exist and not holding such a belief. Moreover there is no reason not to distinguish all of the groups at the outset.
If someone wants to assert one definition is better, then they need to support why their definition is better or more reasoned. When we look at the definition that gives rise to the later distinction of strong and weak atheism, we find that linguistics do not necessarily promote such a definition, history does not necessarily promote such a definition, and logical negation does not necessarily promote such a distinction.
Now I am not opposed to someone pointing out a reason and providing evidence to carry their burden of proof that comes with their assertion that the distinction they prefer is better and reasoned.
People who want the term atheist defined as only what others term "strong atheists" have given reasons. Moreover, they have refuted any evidences provided by people demanding the inclusion of people, uncertain of the existence of god, and entities, to which belief is inapplicable, under the umbrella of atheism.
Given this failure to carry their burden of proof, I am surprised so many "weak atheists" are in the camp lobbying for this broad definition of atheism.