It is a rather simple matter to show that the Pauline letters were composed later than claimed by the Church and its writers.

1. The author of Against Heresies 2.22 could NOT have known of gLuke, Acts of the Apostles, and the Pauline writings and still say the supposed Jesus was crucified under Claudius at about 50 years old.

The written statements in gLuke, Acts of the Apostles and the Pauline writings place the crucifixion of the supposed Jesus under Tiberius at about 33 years of age.

Now, even before Irenaeus, there is Justin Martyr and he too did NOT know of the Pauline writings and Acts of the Apostles.

In Acts and the Pauline writings the character called Paul was documented as the person who was commissioned to preach the Gospel to the Gentiles and the Pauline character went on at least TWO tours of the Roman Empire and preached Christ crucified and resurrected.

However Justin Martyr will say that it was the 12 illiterate disciples of Jesus, NOT Paul, who preached the Gospel to every race of man in the world.

"First Apology" XXXIX

...For from Jerusalem there went out into the world, men, twelve in number, and these illiterate, of no ability in speaking: but by the power of God they proclaimed to every race of men that they were sent by Christ to teach to all the word of God...

Justin Martyr statement about the 12 illiterate disciples would have been known to be false if he knew Acts of the Apostles and the Pauline writings.

The Pauline writings and Acts of the Apostles were UNKNOWN by Justin up to the 2nd century based on "First Apology".