^^ I think mods didn't like us agreeing on those points... :)
Anyway, If state is secular then yes it has nothing to do with the religion at some extent, but if it is Islamic Republic of Pakistan, then yes it is duty of govt. to take care of things like Qadyani Movement & etc
Anyhow, Pakistan is 'Islamic Republic of Pakistan' and it is Islamic principle never to judge anyone on what they believe, as that is matter of heart and only Allah knows what is in heart - but only judge others on what they confess verbally, as we can only use senses what Allah has given and could not speculate on what others believe cause we are creation ourselves, and thus leave the judgment of a person's believes on Allah (that means, if anyone says that they are Muslim, accept that, however unwillingly it may be).