He was clearly having a crisis of faith before we told him about the truth regarding the duality of Maragon (Radika?), so if he wanted to go back to where it all began, he could have gone there without knowing about the truth we tell.
Maybe? Combined with the Divine Gate and Crucible (which the Talisman of All Crucibles tells us the "Mother of Crucibles" sprouted on a giant), it also probably explains Radagon's red hair and all of Radika's kids being mutants.