The Kangaroo is just a deity, like many of the other equally laughable deities invented by man. Just because no organised religion or body or worship has invented it yet, does not mean it has less merit than that of the ones (thousands of them) that have already been invented or worshipped in some way.
There are literally millions of morals, motives, concepts, stories etc which all cultures have tagged their different gods with, that it remains rather obvious that all of them are manmade at the root.
Well, I'm afraid it is a fact until you have something other than faith to give.