The New Testament says NOWHERE that each and every doctrine or practice taught by the apostles is written in the New Testament.
How about answering my challenge: Show me an Apostolic Father or a Sub-apostolic Father who complains about or condemns the practice of asking the saints for their intercession. If it was an innovation contrary to the Faith, then there MUST be complaints about it BEFORE circa the year 1500.
So then simply show proof of where they taught what the Catholic Church teaches.
>>How about answering my challenge: Show me an Apostolic Father or a Sub-apostolic Father who complains about or condemns the practice of asking the saints for their intercession.<<
It matters not whether they complained about it or not. The fact still remains that Paul said if anyone teaches something else.