I think it doesn't have anything to do with Christianity. Rather, with someone lamenting the loss (death?) of a lover... It seems to me that this person is going through the depression phase of loss (Denial, Anger, Bargaining, Depression, Acceptance), and while the words "Christ" and "Fuck" appear joined, it could be interpreted as "Christ! Fuck!" -- random swears that I myself have used in this very context.
I think it doesn't have anything to do with Christianity. Rather, with someone lamenting the loss (death?) of a lover... It seems to me that this person is going through the depression phase of loss (Denial, Anger, Bargaining, Depression, Acceptance), and while the words "Christ" and "Fuck" appear joined, it could be interpreted as "Christ! Fuck!" -- random swears that I myself have used in this very context.
Of course, I could be talking out of my ass.