I think there are way more Muslims who are simply irrelgious and basically the same as us in their views and day to day life.. but they just don't express themselves, preferring to not draw attention. I know 2-5 declared apostates, who clearly state they are disbelievers. But there are tonnes of people I know who are simply irreligious and don't care about the matter of religion at all, I can't call them ex-muslims though.
I know, but if they dont identify themselves as such then they there is a possibility that they will marry a muslim, and the indoctrination will continue into the next generation. For those purposes, I discount them here.