They are dimly seen in Scriptures themselves - thus, it is perfectly correct to see that the Apostles taught these concepts in nascient form from the beginning. For example, how much of a stretch is it between these two verses:
I am certain that neither death nor life nor angels nor principalities nor powers nor things present nor things to come nor height nor depth nor any creature shall be able to separate us from the charity of God, which is in Christ, Jesus our Lord" Romans 8:38-39
And
"The effectual prayer of the righteous [is] very powerful." James 5:16
To come up with prayers of intercessions from the righteous who have died physically but are with Christ? It is certainly a Scriptural teaching that can be clearly inferred from the Scritpures. There are other verses that also speak to the belief that the prayers of the righteous were efficient, for example in the Book of Revelation. Christian practice of the very first century shows that it is a legitimate concept that was taught by the Church. It didn't just crop up somewhere and then it caught on gradually as the "heresy" spread. The people on the ground must have believed it came from the Apostles, or they wouldn't have done it.
Funny, James (the true first Pope) said if you want wisdom ask it of God. One would have thought he would have said, "Run to Peter."
James isn't the first "true Pope". Get over it. And wisdom comes from God, not man. I don't think the Church ever makes the claim to ignore God and seek wisdom in man. The Church's claim to infalliblity and correct teachings stem from God's own protection, not the "wisdom of man".
Regards
Jokus-They are dimly seen in Scriptures themselves...For example, how much of a stretch is it between these two verses
Yes, it is a stretch... ;O)
I wouldn't make any inferences. The Pharisees did and it got them into a lot of trouble.