It takes a legal mind to navigate all the rules and regulations that the Church of Rome has established, then changed over the centuries. Surely God did not intend for salvation to be so convoluted. Many times in Scripture God promises that you can have assurance of your salvation. The Church of Rome always leaves you in doubt, so that you always fear death because you can’t have that promised assurance.
No need to mine anything. The basic dogma is the CREDO and the Catechism of the Church. The alternative is to mine through 35,000 sects of Christianity.