Many of those old dietary laws were good advice; it was indeed dangerous to eat pork and certain dairy products in times where there was no refrigeration, in a Middle eastern climate. It was just common sense, and obviously there were morons who were doing it anyway, or else they wouldn't have brought up dietary laws in the first place. Many of the diseases that were passed on through pork and dairy have been largely wiped out now, so it's not an issue any more. If it weren't an issue then, they wouldn't have bothered, and if those who made the laws then were alive now, they would have no problem now with eating the stuff. It had little to do with religion, really, just a role in lifestyle habits, not theology.