First of all, while Peter may have been credited with the authorship of his two epistles, the Holy Spirit was the true author.
1 Peter 1:
20 Knowing this first, that no prophecy of the scripture is of any private interpretation.
21 For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
Secondly, you nor any other rc can prove that any of it's teachings came directly from the Holy Spirit other than by your say so.
Finally, true Christians can prove beyond a reasonable doubt the true source of rc doctrine actually originated in the pit of hell.