what and leave out the jews? or all those hippie idiots who though not muslims (in this case the belief is usually by way quasi-muslim practices adopted from elements of the militant black power and rastafarian circles) follow the false reasons perpetrated by the uneducated who claim that it is - in no particular order - toxic, unclean, too close to human in its gut morphology, etc.
first off pork is the most efficient meat in terms of protein per feed. second, pigs are far cleaner than either cows, chicken or sheep. the false assumption that they are dirty is due to the fact they roll in mud to cool themselves and when in the care of incompetent or lazy fuckheads who fail to provide such facility for the swine are surprised it will utilize its own shit for the same effect.
oddly some moronic people conclude that the pig is dirty when in fact most pigs will purposely crap in the lowest corner of the sty so as to keep separate from their waste as opposed to cows which frequently shit and lay down in it without ryme or reason.
the real reason though that islam and judaism are against pork is not the bullshit reasons given by their adherents, but rather the ecology of the surrounding lanscape - or lack thereof. pigs are very destructive to such sensitive ecological environments and thus it is not feasible to raise pigs in such surroundings as soon you would have no place for them to forage.
now take this along with the food taboos that are reinforced by the cultures in the area (food is pretty much one of the main cultural dividers as well as pratices surrounding the entire food production and preparation) and the perversion of this natural phenomenon by some guy who invents an imaginary man in the sky and has to weave in such cultural practices that have a lifetime of thousands of years rather than the hundreds of religions/cults and we are pretty much where we are today.