At some point it has to be possible for us to know what God actually wants for us — knowing things outside ourselves needs to be possible. The Christian has to trust this is so otherwise Belief is a pointless endeavour.

There are certain foundationals that the Believer must be take as a priori — a lens through which all other information passes — otherwise ones Faith is built on nothing but his own ideas.

Isn’t your list of foundationals (or at least your interpretation of what these foundationals mean or say) your own idea? I am not saying this to single you out but rather because every believer builds his or her faith on his or her own ideas. We cannot avoid that as human beings.