Very well, what about the marked path though the desert between oases? Or on the high seas in a small ship, depending on a sextant and compass to steer by.
What about, "No one comes to the Father except through me" yet Roman Cultism teaches that Mary is somehow a mediatrix WITH Christ?
The only compass or sextant that anyone needs is found in scripture: Jesus Christ and him alone. Nothing else need be added.
Hoss