Can you imagine the crap that they have to listen to? It must seem like an eternity in purgatory to them, LOL. They don't mind the genuinely clueless, but the "professional" atheists and comedians etc, who make money and notoriety off of their ungrateful disbelief, well, let's just say the guardian angels ought to get battle pay for putting up with all that.
Since God doesn't go around smiting people just for being atheists, some of them force their guardian angel to listen to many decades of their crap. It's something to think about, no? Let's just say that I can relate...