My take is the Pope is looking for a starting point - Charity and Goodwill first and faith will grow from there. If one looks to do good (with the implication they will reject evil), then the 'faith of a mustard seed' can be planted.
Looking at 12 step programs, I see this all the time - they all are programs of repentance. I believe once started, the Lord will guide us to eternal life, thus salvation - whatever we call Him.
BTW. the 'heaven' in the title is from the source, catholic.org - that's why I added salvation to the keywords.
Hopefully I'm just reading you wrong but just in case...
"Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved" (Acts 4:12)
Only problem is that is the same approach Adam and Eve took in the Garden of Eden which led to the fall.