If they don't refer to the Holy Book and seek guidance from elsewhere then they aren't following Islam properly. Islam forbids adultery & drinking but many Muslims indulge with them, does it mean the Haram has become Halal just because Muslims can't abide by the Islamic directives?
The Islamic injunctions are precise and to the point. I don't see the need to address the rest of your post, until you can back your unfounded assertions with a proof of Pakistani's and Muslims escaping the blasphemy laws for disrespecting Prophet Issa (PBUH).
*My nose has no black heads, wheatish fair, and fits proportionately against my facial construct and it is right there where it belongs*