Apparently that's why your religion came up with it's own man-made tradition...
The Gospel of Grace was a mystery, revealed to Paul, and it's still a mystery to you guys...
It was a mystery, hid in God, from the foundation of the world.
Meaning, no one knew it until Paul. Meaning Peter and the 11 did not know it before Paul was given the message. And if Peter didn't know, it isn't 'knowable' to many RCs. Therefore the Gospel of Grace is not taught as the gospel that saves in the RC Church. They teach the gospel Peter was given. The Gospel of the Kingdom. And it isn't the same gospel.
Thank you Iscool, for your very important points.