Rudolf Steiner:
Religion must be replaced by wisdom, by knowledge. In so far as religion rests upon faith and is not inflamed with the fire of full knowledge it is something that must be replaced in the course of humanity's progress. And whereas formerly man had to believe before he could come to knowledge, in the future full knowledge will shine with light and man will know and thence ascend to the recognition of the highest spiritual worlds. From religion mankind evolves to wisdom, glowed through by love. First wisdom, then love, then wisdom glowed through by love.
Now we can ask: If religion is to merge into knowledge, if man is no longer given religion according to the old form, namely, that according to his faith he is directed to the wisdom that guides evolution — will then Christianity too no longer exist? There will be no religion that is founded on mere faith. Christianity will remain; in its origins it was religion — but Christianity is greater than all religion! That is Rosicrucian wisdom. The religious principle of Christianity as it originated was more all-embracing than the religious principle of any other religion. But Christianity is still greater than the religious principle itself. When the outer coverings of faith fall away it will be in wisdom-form. It can entirely strip off the sheaths of faith and become wisdom-religion, and spiritual science will help to prepare men for this. Men will be able to live without the old forms of religion and faith, but they will not be able to live without Christianity, for Christianity is greater than all religion. Christianity exists for the purpose of breaking through all forms of religion, and that which fills men as Christianity will still exist when human souls have grown beyond all mere religious life.