The "mysteries of the kingdom of heaven" is NOT the same as the mystery of the church revealed to Paul. Is what you are saying contrary to doctrine? Romans and Ephesians are doctrinal epistles directed toward the church . . . both speak about the mystery that was hid and that was revealed to Paul and explain what that mystery is and it is not what you are saying nor was it revealed beforehand.
It appears to me that you believe the church and the kingdom of God (kingdom of Jesus) are 2 different things. It seems you believe that Paul is the first revelator of the church, making Jesus' ministry to His disciples without revelation concerning the mystery of His own kingdom.
Matthew 16:13-18
13 When Jesus came into the coasts of Caesarea Philippi, he asked his disciples, saying, Whom do men say that I the Son of man am?
14 And they said, Some say that thou art John the Baptist : some, Elias; and others, Jeremias, or one of the prophets.
15 He saith unto them, But whom say ye that I am?
16 And Simon Peter answered and said , Thou art the Christ, the Son of the living God.
17 And Jesus answered and said unto him, Blessed art thou , Simon Barjona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven.
18 And I say also unto thee, That thou art Peter, and
upon this rock I will build my church; and the gates of hell shall not prevail against it.
John 17:14-19
14
I have given them thy word; and the world hath hated them, because they are not of the world, even as I am not of the world.
15 I pray not that thou shouldest take them out of the world, but that thou shouldest keep them from the evil.
16 They are not of the world, even as I am not of the world.
17 Sanctify them through thy truth: thy word is truth.
18 As thou hast sent me into the world, even so have I also sent them into the world.
19 And for their sakes I sanctify myself, that they also might be
sanctified through the truth.
John 18:36 Jesus answered ,
My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence.
Jesus said to His disciples, "Unto you it is given to know the
mysteries of the kingdom of God:" (Luke 2:10a)
"But glory, honour, and peace, to every man that worketh good,
to the Jew first, and also to the Gentile:" (Romans 2:10)
Colossians 1:12-13
12 Giving thanks unto the Father, which hath made us meet to be partakers of the inheritance of the saints in light:
13 Who hath delivered us from the power of darkness, and hath
translated us into the kingdom of his dear Son: