Anthroposophy is neither an adversary of religion nor of science. It wants to attain truth like the researchers by knowledge, and it does not deny the basic truth of the religions.
This basic truth is often little understood by those who represent the religions. Original, eternal truth forms the basis of all religions. The religions existing today developed from it. Then, however, later ingredients overgrew them. They lost their deeper truth. The core of truth lies behind them. However, science has not yet advanced so far that it has ascended from the matter to the spirit. It is not yet so far that it investigates the spiritual with the same enthusiasm as it investigates the natural phenomena. Science finds its core of truth in future. So, this higher truth of religion got lost, and science has not yet found it. Today, anthroposophy stands between them. It falls back on the past, on the lost, and it tries to investigate in the future what has not yet been found. In return, it is attacked by both sides. The habits and the external customs of today are different from those of former times, but in spite of the frequently praised tolerance of our modern time one still tries to intimidate those who represent an uncomfortable opinion. Somebody who speaks of the soul today, like the naturalist speaks of the external facts, is no longer burnt, indeed, but also methods are found to burden and to suppress him.
Source: Rudolf Steiner – GA 52 – Spiritual Teachings of Soul/World: Course I: Lecture II: The Origin of the Soul – Berlin, October 3, 1903