I once met a pakistani muslim here(of pakistani origin, spent most of his life here, so british pakistani), who drinks, smokes stuff(guess marijuana) and is generally dismissive towards observant muslims.. but he still considers himself muslim.. we got to make that distinction, he is not atheist(in his mind), he is just not willing to do what muslims are prescribed to do... and he has probably convinced himself that he will be judged favorably after death. He is still a muslim, I would say.
I specifically asked about ordinary people who lost faith. they have to live like any other people, liberals live in bubble, their lives are not representative of ordinary pakistanis.