Based on the presented materials, one can note that religious truth appears as a universal revelation, where individual religions can be regarded as incomplete or preliminary manifestations of that unity, while Christian revelation, according to one of the authors, occupies a special position.

Christian Revelation as the Fulcrum of Universal Religious Experience

Based on the presented materials, one can note that religious truth appears as a universal revelation, where individual religions can be regarded as incomplete or preliminary manifestations of that unity, while Christian revelation, according to one of the authors, occupies a special position. For example, one of the sources states:

"Christian revelation is the universal revelation, and everything that appears in other religions similar to Christianity is only part of the Christian revelation. Christianity is not just one religion among others; Christianity is the religion of religions (Schleiermacher’s expression). Even if, taken in a differential sense, nothing original exists in Christianity aside from the manifestation of Christ, the personality of Christ, it is in this original uniqueness of Christianity that the hope of all religions is realized. And the revelations of all religions were only a prelude and premonition of Christian revelation."
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This statement implies that true revelation is expressed precisely in the Christian tradition, which encapsulates the essence and the harbingers of all other religious manifestations.

Regarding the question of the existence of God, the materials present reflections based on philosophical-ontological, cosmological, and moral proofs. One source notes:

"The cosmological, physicotheological, and moral proofs of God's existence represent a unity—they are permeated by a single thought, which is easily noticeable when comparing their contents. The cosmological proof states that it is necessary to admit the absolute; the physicotheological proof continues that this absolute is not a thing or a system of things—a substance or a certain sum of atoms—but that it is a mind, a thought, something by whose power things not only exist but also justify their existence; finally, the moral proof teaches that this thought has not only an external existence in the objects of the world but also an internal, self-concentrated one..."
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It is also stated that the essence of God does not lend itself to complete rational comprehension:

"This does not prove but shows the existence of God, as it reveals a spiritual element within man. Even more important is the primordial intuition, which cannot be adequately expressed..."
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Thus, the materials reflect two main ideas. The first is that Christian revelation is presented as the most complete and final manifestation of truth, which allows Christianity to be seen as the religion that encapsulates the entire essence of universal religious experience. The second idea emphasizes that the existence of God is confirmed not so much through direct proofs but rather through spiritual, cosmological, and moral arguments, indicating that God is not merely an object of being but the fundamental foundation of all that exists.

Supporting citation(s):
"Christian revelation is the universal revelation, and everything that appears in other religions similar to Christianity is only part of the Christian revelation..." (source: link txt)

"The cosmological, physicotheological, and moral proofs of God's existence represent a unity..." (source: link txt)

"This does not prove but shows the existence of God, as it reveals a spiritual element within man..." (source: link txt)