In the parable in Mark 7:1-23 Jesus permits all [meats] whereas the sixth sura Al-'An am [6:116-118] declares that most [meats] will mislead us and therefore the [meat] that Allah prescribes is recommended. http://quran.com/6/116-118 Because Man is 1/3 of the sentient creation and because Angels care not to bow to Man we could deduce that the scriptures could be falsified in key areas.
There is nothing outside a person that by going into him can defile him, but the things that come out of a person are what defile him. http://biblia.com/bible/esv/Mark%207.1-23
Emperor Constantine, the original "Readers Digest Editor" lol "Hmmm, the Jews awen't happy in my Pagan Empire,,, OH HEY! Waaaait, nooo, behave you Jewish Wapscawions I bewieve that stuff too now!! http://gnosis.org/naghamm/gosthom.html
In both the time period and area where islam came to be there were both Jews and christians to take notice of. I can see how one would say islam was in some way a reaction of the arabs to the presence of both religions in the area but I don't really get the claim in the OP in regards to those quotes.
something about being able to eat some animals and not others seems real foreign The only reason we don't have cat and dog is cause they taste lousy
Well, most of the "Unclean" animals were bottom feeders or otherwise wallowed in filth and back in the day fishing industries were very local so you would have them pretty much feasting on the Urban sewage of the era. Meaning loaded with all sorts of Human pathogens and nastiness. I'd also hazard a guess that there are many folks in various parts of the world who would argue rather intently about the merits and fine flavor's to be found in the wide world of Dog & Cat eaters? http://www.thedailymeal.com/9-countries-eat-cats-and-dogs/11414