[St_Thomas_Aquinas]

—Which Church? The Orthodox? The Roman Catholic Church? —

One Church has as an unbroken line of successors to St. Peter. The other Church hasn’t called a Council since the Schism.

Nevertheless, before I completely alienate our Orthodox brethren, there is very little difference in Catholic/Orthodox teaching. Catholics recognize the validity of Orthodox sacraments. In fact, Catholics can meet their Sunday obligation by attending Mass at an Orthodox church, subject to the Orthodox priest’s permission.

Luther’s doctrine of Solar Scriptural has not resulted in Christian unity, but more importantly, his doctrine isn’t Scriptural.

[HarleyD]

But only one authority could be right-all others must be wrong. I find it interesting that you stated "Catholics can meet their Sunday obligation...". I would suggest there is a work mentality in that statement. If one feels they are obligated to go to church rather than wanting to go to church, then they might as well not bother. Trust me when I say God really doesn't need them and they're not going to get "sacramental points" from Him.

As far as Luther goes, I believe we started this conversation with stating how close the Catholics and Lutherans viewed things. Apparently they're not that close. I would add that Sola Scriptural is far more scriptural then the Catholic current view on the atonement (it's been changed), indulgents, or Mary as Co-Redemptix.