Is it permissible to eat meat slaughtered in a non-Islamic manner, provided one says "Bismillah" and recites the Shahada before eating, especially if some of it is available as halal while other types are not available except through non-Islamic methods?

For an animal to be lawful (halal) to eat, it is a condition that it be slaughtered by a Muslim or a person of the Book (Christian or Jew), and that the name of Allah be pronounced over it. If the name of other than Allah is pronounced, or if the pronouncement of the name of Allah is intentionally omitted, then the slaughtered animal is not lawful. It is permissible to eat what has been slaughtered by the People of the Book according to some scholars, even if they pronounce the name of other than Allah. As for uttering the Shahada (testimony of faith) at the time of slaughter, there is a difference of opinion regarding it. The Hanafis and Malikis held that uttering something other than the Basmala, such as "Alhamdulillah" (Praise be to Allah) or "Subhanallah" (Glory be to Allah), with the intention of naming Allah, is sufficient. The Hanbalis, however, stipulated the specific wording "Bismillah" (In the name of Allah). If the pronouncement of the name of Allah is intentionally omitted, it is not permissible to eat, except according to the Shafi'is. One should verify the method of slaughter to avoid consuming carrion, and not rely solely on "halal" labels.