There is that narrow path which some from Geneva and some from Rome have been able to follow, as well as a large number of other believers.
The proof is in the pudding. I always want to chuckle a little bit when somebody attempts to argue salvation and regeneration of the human spirit with a believer relying upon theological arguments and ignoring the reality of the Christian way of life.
It's spiritual walk. It's very real. It is a different perception than the physical or the soulish intellect. His Word is the only source I have found which accurately describes it with veracity. It also provides guidance on how we are able to continue to walk with Him, and how we come to understand a sense of destiny through Him. One of the greatest discoveries is how to live as He has planned for our individual and collective lives as members of His body.
Those from Rome are not saved, full stop.