At the outset of this thread I'd like to make a sincere disclaimer. I am not starting this thread to start a debate full of strife or discord among the brethren. I simply thought it would be good for us to think through this issue a bit and respectfully discuss it amongst us.
These are some thoughts that came to mind, some of my current views or leanings on this:
The RCC, as an official system of religion, is seriously heretical and a cult by definition. This is clearly seen in reading the Catholic Catechism, the official RCC statement of faith.
That being said, I believe there are some true believers within that system, like there are true believers within other heretical systems such as the Word of Faith prosperity gospel movement. As such I would never recommend for any true believers to remain within such a cultish system but to immediately come out of it. I would lovingly try to warn them regarding it.
Regarding the Early Church Fathers, I understand that the earlier the better. However, it seems clear that it didn't take that long for early church leaders to come up with serious aberrations from the faith once for all delivered to the saints. For example, this article shows how some of the apostolic fathers believed and taught on purgatory:
http://en.wikipedia.org/wiki/History_of_Purgatory#Purification_after_death
I would not question the salvation of some of these church fathers solely based on their embrace of certain heretical RCC views. But I would also not recommend nor see it as necessary or that beneficial to read their writings. And I would be willing to respectfully agree to disagree with brethren who feel otherwise on some of those writings. I would only be seriously concerned if it is implied we can embrace the current RCC system as a true church within the Body of Christ.
All that being said, a good point has been made about how we got the canon of Scripture. And I also thought about all the essential doctrines that were defended by the early church fathers in the councils. My response regarding that would be that God used those leaders and councils to preserve His Word IN SPITE OF the serious errors within the RCC system.
