Quite a few, though that has never been my aim.
I generally don't broadcast my atheism simply because no situation has arisen where I would need to do so, therefore I don't hold myself responsible for the apostasy of anyone.
Ironically the fact that I am not obsessed with trying to "defeat Islam" means that I may actually end up having more effect on some Muslims.
True, the best that one can hope for is for them to soften their stance and not make huge claims on truth. The peaceful muslim who simply prays and fasts doesn't bother me.
Leaving Islam is no bed of roses and I can't say I have found a wonderfully happy place to replace the comfort religion can bring. But for me it is more important to be true to myself. Others can make their own mind up - I'm not interested in trying to make anyone leave Islam.
I couldn't have put it any better.