Hey there, Ladonia!
(as a side note, please to not infer that I am trying to say anything about the RCC in what I'm about to say)
The Orthodox Church does not see the Christian faith as a set of facts about reality. Rather, it is a path of pursuing full communion with God. It is a fact that we live in space-time and have certain physical and linguistic limitations. That being the case, we have to find a way to describe the path of pursuing Christ. One way that that was done was by formulating the Nicene-Constantinopolitan Creed. It makes some declarations about what we believe about God. But the point of that is not to give a set of facts about God. Rather, it articulates, limitedly, the experience of the Church in the life of God as He has revealed Himself to us. These statements help us to stay on the path of rightly knowing God as He has revealed Himself.
The same goes for any catechism. Each person is on a path to knowing God and entering into full communion with Him. Different people are at different places spiritually, and need different things in getting them ready to be received into the Church, or for general spiritual growth. While certain things may be "generally true", that path to knowing God must be discerned between the individual and his/her spiritual father, who is intimately familiar with their spiritual needs and has, hopefully, progressed down that road himself.
We have the Creed. We have the Liturgy. We have our hymns. We have our prayers. We have our community. THAT is our catechism. As we engage the spiritual life and begin to progress down the path of knowing God, we engage the hymns/prayers/Liturgy and thus begin to acquire the knowledge of God in our lives.
Does that make any sense?