"The idea that the Causeways were so the Pharaoh could walk up and down, is as preposterous"

I agree. Where did you get that? Be specific please cuz I'll bet you are misinterpreting something.

if you look at reliefs concerning the afterlife you'll oft notice a little bird like character...

But that's just one aspect of the symbolism.

What you see is a conduit between the land of the Living and the Land of the dead

It probably also had a processional purpose

and it may have been employed (somehow) during construction of the Complex.

Of course, if you dispute what we think we know of their beliefs, and dispute what we think we know of their Funerary rituals, fetishes,totems and constructs....

you are taking an extremely 1 dimensional view of a multidimensional Culture.

Warwick