Some chance!
In the same way as there are thousands of Christian denominations, churches and creeds, many of these rejecting some or all of the others, this could well be happening to atheism.
The 'You do believe in Jesus Christ? You're in!' just does not happen.
The 'You don't believe in Gods? You're in!' probably won't happen either.
Atheism doesn't have "sects". Period. There is no way to "chop up" disbelief in god in a bunch of different ways. No way to interpret and reinterpret.
The only thing you could possibly be talking about is if a bunch of atheists get together and form a "club", and then adopt an agenda, and then move forward trying to push the agenda. But, by definition, such an agenda has
nothing to do with atheism. Whereas theist agendas almost always have everything to do with theism.
For example, an atheist club could decide to "evangelize" - going around trying to actively "deprogram" theists. This is the agenda of that specific group - because atheism does not encompass anything like this. Atheism is me not believing claims made about god... it is not me going around telling others not to believe you - that is
something else. Theism, on the other hand, may include all sorts of dictates from the god believed in, or ideas held by believers because they think it reflects what their god thinks, etc.
TONS of baggage to carry around and try to foist onto the next unwitting victim of a conversion tactic. Atheism has none of this intrinsically. None of it.