[1000 silverlings]

Well there are so many references to the kingdom , here's one that shows that belief in the gospel that John came preaching gets you into the kingdom

Matthew 21:31. Jesus saith unto them, Verily I say unto you, That the publicans and the harlots go into the kingdom of God before you.

32For John came unto you in the way of righteousness, and ye believed him not: but the publicans and the harlots believed him:

[count-your-change]

Please.....the subject was “keys”.

“whoever has the Gospel of Jesus Christ, understands it, preaches and teaches it, has the keys to the kingdom.

If you don’t know just say so or do a quick search but belief in the gospel was not called a “key” that Peter used.