Mat 8:10 When Jesus heard this, he marveled and said to those who followed him, "Truly, I tell you, with no one in Israel have I found such faith.
Not, To no one else have I given such faith, but "have I found such faith".
Jesus came to give sight to the blind...Mat 9:29 Then he touched their eyes, saying, "According to your faith be it done to you."
Mar 5:34 And he said to her, "Daughter, your faith has made you well; go in peace, and be healed of your disease."
Jesus promised "And whatever you ask in prayer, you will receive, if you have faith." - Matt 21. Not, if I give you faith, but if you have faith.
When Jesus started his ministry, he proclaimed "The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel." (Mark 1) He commanded those hearing to repent and believe. He didn't offer to give them faith and belief, but commanded them to do it - "repent and believe in the gospel".
I make no pretense of saving myself. I can do nothing to force God to call me good. All I can do is accept his offer, and obey his command - "Repent, and believe".
I spent 25 years in the military. Commands are not passive. They demand a response from the person hearing the command.
What is the rock? Is it the supernatural belief given to each Christian or is it Peter? Why do I have a nagging suspicion that you think it's Peter?