En udbredt tro i new age er perennialisme, hvilket er forestillingen om, at alle religioner har en fælles kerne. Tanken er, at man bestræber sig på at gå bag om forskellene mellem de religiøse traditioner med det formål at finde frem til den ultimative og indre kerne af sandhed.

From the beginning, Islam has considered itself to be the final flourishing of perennial wisdom before the "end of times".[50] The Qur'an is replete with references to earlier religious figures from the Jewish and Christian traditions, considering that Abraham, Moses, Jesus, Mary and other holy figures were always muslim (i.e. they were followers of the oneness of god).[51] The idea of a single religious truth is more apparent at a deeper level of Islam, such as Sufism or mystical traditions of Islam, with parallelisms in the Judaeo-Christian and Hindu tradition,[52] than it is among scholars dealing with doctrinal issues, who recognise the Jewish and Christian truths, and possibility of non-Abrahamic traditions, but by necessity reject all beliefs that seem contrary to Islam (such as the Trinity, the sonship of Christ, or the reality of the crucifixion).[53] Modern Islamist movements, on the other hand (e.g. Salafism), tend to reject entirely all other religious traditions as also the diversity among Muslim communities.

Selvspiritualitet er et afgørende og fast kendetegn ved new age. Det betyder, at new age-tilhængere har en grundlæggende tro på, at det guddommelige findes i menneskets eget indre.