Yes it's quite effective, coffee table pop history YouTube version.
Of course the Egyptians believed in the immortal soul before the monotheistic religions came along, that's why they mummified bodies and put food and gold in their tombs for the next life.
Isis, Osiris and Horus were a trinity yes, although more accurately a triad, mother, father and son.
This has not been hidden from everyone Adjustments. What on earth do you mean? I knew this when I researched my project on ancient Egypt at primary school aged 10.
Where have you been?