The ideas of philosophy, mysticism and religion have validity the same as civilization, industralization and agriculture; they are all constructs of humanity, but they can not be use to explain things outside the scope of humanity.
You left out science and mathematics. Why?
Humanity is millions of years old; religion and philosophy equates in this scheme to television and radio, just another incarnation in the human experience.
In that case, science is widescreen television, and modern physics is plasma widescreen televisions. You can't disregard religion and philosophy merely because they are of human origin - anymore that you can disregard quantum mechanics.
If these things that you promote are absolute truth, doesn't stand to reason that they would be eternal. Can you honestly say that one hundred thousand years from now, that religion(bhuddism and such the like) and or [television] will still be relevant.
Will Pythagoras' theorem be relevant in one hundred thousand years? Yes, assuming there is intelligence interfacing with our current universe. Philosophy in general and even specifically the philosophy of religion will continue to reguritate simply because they address fundamental relationships that intelligence will inevitably continue to address in one hundred thousand years (or one billion years). Whether a specific human religion is around in some form will all depend either on there being a God that intends for one or more of our religions to be relevant in some form, or there is something philosophically inherent in the religion such that it will survive in some form. For example, many Christians over the millenia have held to neo-platonist thinking, and this particular philosophy might survive one-hundred thousand years - making some form of Christianity relevant to an advanced intelligence.