"I believe what makes this so difficult to believe (God telling Paul a secret), is not many will accept, and understand what God Hid. They don't want to believe the revelations that Paul puts before us, for Jesus Christ on earth didn't tell anyone about The Gentile being justified through faith, and the Jew could now come just as the Gentile. No where in Prophecy are we told it is Now the Jew can be saved just as a Gentile; And it is the Gentile, in this dispensation that will Spread the Gospel of The Grace Of God thoughout the Whole World. "
Look up the word church in a concordance. You will see the first two mentions are by Jesus himself.
Matt 16:16 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.
Matt 18:17 And if he shall neglect to hear them, tell it unto the church: but if he neglect to hear the church, let him be unto thee as an heathen man and a publican.
Jesus was addressing Jews in both these cases.
And in Acts;
Acts 2:47 Praising God, and having favour with all the people. And the Lord added to the church daily such as should be saved.
Again, these were Jews only.
Did Jesus mention Jews being saved by faith only? Let's see.
Luke 5:20 And when he saw their faith, he said unto him, Man, thy sins are forgiven thee.
Luke 7:47 Wherefore I say unto thee, Her sins, which are many, are forgiven; for she loved much: but to whom little is forgiven, the same loveth little.
48 And he said unto her, Thy sins are forgiven. 49 And they that sat at meat with him began to say within themselves, Who is this that forgiveth sins also?
50 And he said to the woman, Thy faith hath saved thee; go in peace.
Again, all these verses are spoken to Jews. So not only did Jesus speak of the church, he also showed that a Jew could be saved by faith alone.
And did Jesus mention the Gentiles before Acts? Let's see.
Luke 13:28 There shall be weeping and gnashing of teeth, when ye shall see Abraham, and Isaac, and Jacob, and all the prophets, in the kingdom of God, and you yourselves thrust out.
29 And they shall come from the east, and from the west, and from the north, and from the south, and shall sit down in the kingdom of God.
Jesus said there would be weeping and gnashing of teeth when these Jews found themselves thrust out of the kingdom of God, and then tells them that Gentiles from the east, west, north, and south will sit down in the kingdom of God.