Coldplay being Brits, the analysis above may be accurate. But I can't help but wonder if the band envisions the song being the thoughts of the soon-to-be-unlamented George W. Bush? The band has a liberal bent, and heaven knows that, for better or worse, he's been the single most dominant figure of the last 7 years.
Btw: the lyric is indisputably "I know St. Peter WON'T call my name." Some Grado headphones, a lossless recording, and quality equipment. Well, the sound he makes (he doesn't pronounce the 't' hard) is unquestionably an 'o' sound, as in "won't".