I see more insecurity in those who insist there can be no change, ever, in our understanding of God and Church.  It seems to me some feel their faith is ashes if they can't count on religion always being the same as it was when they were six years old, always being perceived and practiced exactly the same.  Fear of becoming a minority underpins the occasional remarks we hear that "Catholics must have more babies" with the implied or outright stated "because OMG the Muslims!" 

God created this world, this universe, and everybody and everything in it.  We shouldn't be afraid to reach out and learn from this vastness, about God who created lions and lambs, grass and redwoods, rivers and deserts -- who put a rainbow in the sky and resurrected his son.   What kid of hubris insists we have learned all there is to learn of him, and nobody else has learned anything unless it's the same?