The Catholic Church fixes everything as a mystery, except of course, the various eternally fixed doctrines and answers they provide as revealed exclusively to them and which defy logic.
>>Like the Trinity and the Incarnation.
" >>Like the Trinity and the Incarnation."
Yes, those are 2. They are given in the Bible, but the Church fixed them as unfathomable mysteries and added the hypostatic union nonsense and conjured up the falsehood of original sin to confound understanding of both the Incarnation and the resultant Trinity.