@ace mooha man you need to calm down.
there's no compulsion in religion so if they decided to no longer be Muslim that's their choice and its none of our business.
as long as they not like ayan hirsi ali and are not disrespecting islam then you really are not in a place to pass judgement.
you need to stop calling them infidels and pray for them instead, you aren't really showing a good image of Islam with your profanity and crazy outbursts.
@sassso dont tell your parents. i honestly have nothing against atheists but it would break my heart if my child told me they no longer wanted to be Muslim. am sure you are already aware of the responsibility of Muslim parents to bring up their kid as Muslim and your mom just like any other Muslim parent would think that she somehow failed and would put so much blame on herself.
you are not bring forced to wear the hijab so there's not really anything else that would cause suspicion if you started/ stopped doing. just live your life how you want but let your parents live in their ignorance.