Also in the book of Acts 2:21: And it shall come to pass, [that] whosoever shall call on the name of the Lord shall be saved.
Very true. The obvious conclusion is that no one can cherry pick one or two verses from the Bible and make the claim that this (praying the believers prayer - calling on the name of the lord - accepting Christ into your heart - whatever) ALONE is the way to be saved.
Only if and when one hears, believes, repents, confesses and is baptized; will one then be saved.