Look. I am a Muslim. That means, by religious scriptures, we are programmed to avoid pork. why? Simply because "god told us to avoid pork". No other thing. Abstain from eating pork and people follow that.
Now, when it comes to saving a life, those religious considerations do not stand because a life is at stake. Same for " consuming wine is prohibited" but if alcohol is necessary as a medicine, its allowed because the intention is not to get drunk but to get treated. That is important.
Now, when it comes to using a pig heart as a replacement, I am pretty sure no resonable person, from any religion would have problems with because the end goal is to save a human life.
These PETA people are keeping themselves relevant by being the dissenting voice that nobody has to listen. Yeah, if PETA or their supporters are reading this, again, fuck you. Let us save lives and your organization can watch us do it.