Sorry that it took me a couple of days to go back to the sources I read years ago on this topic. I remembered the story a bit more literally than is exactly accurate.
The night of Jagger’s birth may or may not have been the night of an attack, but the crossfire hurricane in which he was born surely was the fury of war in his neighborhood and in the skies overhead.
Jagger was born in Dartford on July 26, 1943. During the two years before his birth over eleven thousand homes were damaged by bombs and at least 150 killed there. The town’s schoolchildren had largely been evacuated west. The day prior to his birth, the RAF had dropped two thousand tons of bombs on Essen. In June 1944 the V-1 attacks began. The Chronicle’s headlines for that month and July convey the terror of the times: “Flying Bombs Night and Day”; “Parents, Daughter, and Cook Killed”; “Child Killed Running for Shelter”. On August 26, fourteen were killed and eleven injured in Carrington Road less than a mile from the Jaggers. Source: Mick Jagger: Primitive Cool, Christopher Sandford, St. Martin’s Press, 1993, 18-19.
The narrow swatch between the southeastern coast of Kent and London was pummelled mercilessly by German forces, and most of the casualties were either residents of London or of one or another of the small industrial towns unfortunate to be in the flight path. None of the cities in this path was hit as hard as Danford where Jagger spent his childhood. Exploding bombs, the thunder of antiaircraft guns, dogfights between the Luftwaffe and RAF in the skies overhead, showers of shrapnel and the house next door that vanished with all of its inhabitants in a blinding flash were all part of Jagger’s earliest memories. Source: Jagger, Christopher Anderson, Dell, 1993, 19-21.
Jagger himself added the lyrics “I was born in a crossfire hurricane” to Wyman’s song. Sanford, 123.
Within an hour, Jagger wrote the lyrics of Jumpin’ Jack Flash. Anderson, 209. The second chapter of Anderson’s book, dealing with Jagger’s childhood and youth, begins with a text heading, “I was born in a crossfire hurricane.”
The imagery of being washed up and being left for dead, immediately followed by frowning at a crust of bread seem pretty likely to be sacramental allusisions, especially because they come in a stanza where the speaker also alludes to looking down at his bleeding feet and being crowned with a spike. No source here, that’s my own analysis of the stanza.