I’ll be waiting to see them.
Most of the early Church fathers came out of pagan cultures. While they give insight into great theological truths their writings are not and never were considered "inspired" by the Church. Consequently, the Church, on record admit they are prone to errors.
Just because the early church might have held a certain view does not necessarily mean it was the correct view. What you would have to show is where praying to the dead is clearly defined in the council of the early church-not in various writings.
Do you accept what the Roman magesterium teaches you without inspection or not?
If you accept the teachings of the magesterium without inspection, then it is purely blind faith.
If you accept it with inspection then you MUST make a private interpretation so as to conclude it is correct or not.
You cannot have it both ways, unless you practice the Hegelian dialectic.
Find dogmatic writings from the first three centuries of the Church which teach the Roman Catholic dogmas of the Assumption of Mary, the Imaculate Conception, Roman papal infallibility, praying to angels and the souls of departed saints, transubstantiation of the elemements of the Eucharist as dogmatically defined by Rome, submission to the pope of Rome as neccessary for the attainment of salvation as per the Unam Sanctum.
That is for starters.
I'll be waiting to see them.