Let me ask you this: if Noah had used built the ark out of metal or mud, do you think it would have saved him and his family from the flood? What about if he had built it out of pine or oak? God told him to use gopher wood. If he had changed the pattern he was given by God, do you think for a moment that he would have been saved?
Here's another example: Nadab and Abihu offered fire that was from a source God did not authorize. He killed them on the spot and demanded they not be mourned. Was the pattern important here?
Finally, when the children of Israel were besieged by a plague of snakes due to their infidelity, God gave them a way out. They were to look upon a brass serpent that Moses had raised up on a pole. If anyone did not look at it, do you think he would have been saved from his snake bite, which was the just punishment for his sins?
These are three good examples which you can find in the Old Testament, patterns which, while they are different in their particulars, show God's insistence on obedience, and not just to the general plan, but to the exact pattern. When you mention Jesus's disputing with the Pharisees, it was because they had added their own traditions to the Law of Moses, things like a ceremonial washing of the hands before eating, and performing one's oaths before God. He wasn't saying that washing your hands before you eat was a bad thing, mind, but that it was of little importance in the grand scheme of things. That doesn't exclude obedience to those things which are commanded of us by God, doesn't mean that you don't have to do as you're told, because it is God who is telling you.
President W. Bush confused worship with war ship. War ships are made of iron, and they float. Airplanes are made of anodized aluminum, and they fly through the air. Of course much of that miracle is because air takes a longer path over the top of the wing, so the pressure is less (google Joukowski airfoil). Explain, then, how a plane can fly upside down. If a plane presses down on air below it, why aren't people on the ground crushed? A nun's uniform is called a habit. Isn't it true that the flying nun was lofted by the force of habit?
If not for gopher wood, gophers might have refused to get on the ark....then no more gophers. It's like the Gay dinosaurs.
Were the people who didn't look at the brass snake also saved from snakes?
Maybe the bible isn't the only book that we must follow? War of the Worlds says that Martians will attack earth. Maybe if we went out with shotguns at night, we might spot one of those 40 foot tall, three legged Martians so we could blast it? Those cleaver Matians substituted a water tower in Grover's Mill, New Jersey for a dead Martian, just to discredit us. (source: hypertext link below)
Grovers Mill, NJ - Water Tower Mistaken for a Martian