When God created Adam & Eve in the Garden of Eden he didn't give them a mortar & pestle and an oven, so maybe the eating of grain is an invention of Man and Jesus was relating to the masses to get his message across.
I think you need to be really careful with statements like this. Ideas like this are what leads to very heated arguments and in the extreme; holy wars.
That is a true statement and I don't really see it as inflammatory, consider how many billions of people will agree that that is an accurate assessment of their own religions. I hope for peaceful, respectful dialogue, never battles, so I look forward to your response to be able to modify my position and/or mode of expressing it, if necessary.