(V):

Well, Christian philosphy is in essence stoic philosophy. Origen is proof of that. Stoicism was founded by Zeno, and he saw the universe itself as God. That is in perfect line with the Abrahamic religions and it is why stoicism became so influential on early Christian thought. The unmoved mover that Aristotle presented was also in line with Abrahamic thought. It is for these reasons that Christians adopted Aristotelian, Platonic and stoic philosophies. Once stoicism had taken hold in Christianity, the pagan origins of the philosophy had to be discarded and that was done by Justinian I in 529 BC when he closed all Graeco-Roman philosophy schools. In doing so the complete absorption of stoicism into Christianity took place, and the denial of its Greek and Roman origins plunged western culture into obscurantism. It took about 800 years for western culture to mature to a point where it could accept Graeco-Roman philosophy without seeing it as some pagan threat to Christianity.

Of course, believing in the unmoved mover, or a similar theistic view of the universe, is an act of faith. Nobody can prove scientifically that there was an "unmoved mover" or a god when the universe was created. As with everything to do with God, faith is the determining factor. Without faith Graeco-Roman (and later Christian) idealism fall apart.