That sounds like a red herring logical fallacy TC. What I hear is that you can’t prove a single soul was lost.
prove is a big word, of course I can't prove that a single soul was lost, but common sense would seem to indicate that if Jesus Christ Himself (GOD) established a church on His Apostles, gave instruction that it should be followed, established Sacraments to ensure that manking could live up to His expectations, and gave that church the keys to the kingdom of Heaven, and established, by name, its' first titular leader.....one would be in serious trouble by denying His authority to do so by revolting against it....I wouldn't take the chance.