It was shown to me that The Western part of the Church uses the philosophical language of Aristotle while the Eastern Church uses the language of Plato.
I think this statement requires a few qualifications. Aristotelianism really didn’t figure prominently in the western or latin Church until the early second millenium particularly among the scholastic theologians when the translation of Aristotle’s works into latin became widely disseminated. St Augustine who was a latin father used the philosophy of Plato much more than that of Aristotle and thus even among some of the scholastic theologians, particularly the Franciscan school and St Bonaventura, Platonism figures more prominently in their philosophy and theology than Aristotelianism in various ways such as Plato’s idea of participation. Aristotelianism figures prominently in the philosophy of St Thomas Aquinas and his teacher, St Albert the Great, who were both Dominicans, with elements of Platonism however too. Aquinas’ natural philosophy is a synthesis of the best of Plato and Aristotle and other philosophers and even Aristotle’s thought is a synthesis in various ways of the greek philosophers who went before him including Plato of whom Aristotle was a pupil of in his younger days. Aristotle’s formal cause which is one of the four causes of things in his philosophy is derived from Plato though with some modifications. Plato’s idea of participation figures prominently in the philosophy and theology of Aquinas, for example, the being or existence of creatures is a created participation in God’s being or existence.
I’d really love to learn more about how scholasticism, in essence, is truly complementary to the faith. I hope this makes sense.
St Thomas Aquinas is the greatest of the scholastic theologians and it is his philosophy and theology that the Catholic Church, in a sense, has taken for its own and praised above all others among the scholastics. To learn how scholasticism is truly complementary to the faith, I would recommend reading Aquinas’ works many of which are online in english and particularly his Summa Theologica. See the following link:
https://dhspriory.org/thomas/
For an introduction to Aquinas’ philosophy and metaphysics, Edward Feser has recently written a couple of excellent books on this though I’m not sure they are available for free online though you may be able to get a kindle like edition. A couple of Feser’s books are:
‘Aquinas - A Beginner’s Guide’
‘Scholastic Metaphysics - A Contemporary Introduction’
Feser’s newest book which is just being published and released now and which looks very interesting is called ‘Aristotle’s Revenge: The Metaphysical Foundations of Physical and Biological Science’.