None of which are provable nor falsifiable.
Your claim is therefore just an assertion that cannot be proven.
The institution of confession and the Eucharist are most clearly indicated in the Gospels, why are you deaf to the Word of God?
The institution to a priest (not a church office, btw), is not found in Scripture. The "eucharist" in Scripture is the Lord's Supper - a memorial to do until He returns.
Images of God were forbidden prior to the Incarnation. But now that Jesus Christ has come in the flesh, images of Him are not only permitted but encouraged, by Jesus Christ Himself, leaving us the three images I mentioned during His Passion and Resurrection.
While you may be correct that those images cannot be proven to have been made directly by God using principles of natural science, one can turn it around and examine whether those images could have been made by human ingenuity?
If you have any familiarity with the Shroud (Google is your friend) you would know that the photographic negative left on that piece of cloth thousands of years before the advent of photography and the fact that the image is made by the non-pigmented colorization of the micro-fibrils above the surface of the cloth indicate that a human could not have painted it or manufactured it.
If you go back to the original article posted by Marshmallow and actually read about the relics of St. John the Baptist, St. Paul, St. Lawrence, St. Mary Magdelan, one can see that these precious relics are no different than a beloved family photo album. These great friends of God are memorialized in the Church by monuments to their relics, giving us pause for reflection and imitation, highlighting the holiness of these great ones, their life of love and service to Jesus Christ, Who is the Way, the Truth, and the Life.