I see. I get the perspective of this but ultimately there is no cross over from egyptian sacred system to biblical, that would be from an outsider perspective attempting to describe and define by making correlation to these "mystery occults" . Or in another way a re-write of one belief system that predates the system of belief describing the precursor system. Symbolism can and has been hijacked and then used for other purposes of ideology. A swastika is a great example of this. Obelisks arguably fall into the same manner of ideology change, among many other "symbols". Pentagram, pyramids etc.