Not to diminish this lady's pain, but a more logical response to the 7/7 attacks would be to lose one's faith in Islam, not Christianity.
"As far as the earth is above the earth, so are my ways above your ways, saith the Lord".
If she believed in the God of the Bible, she would understand that our sufferings are well, rather predictible. Not to be glib about hers...it is dreadful. But seems that she should find consolation in that the fact that her suffering is perfectly consistent with the God of the Bible.
The headline doesn't match the story, though. The lady feels unable to function as a Christian priest, because her personal feelings were getting in the way. Nowhere does it say she lost her faith in God, or in Christianity.
I think she is resigning because she does have faith in Christianity, but feels she cannot live up to Christianity's demands because she cannot forgive the people who killed her daughter. My heart aches for her. (By the way, I am skeptical that God would expect this poor woman to "forgive" the men who murdered her daughter. Seems to me that "turn the other cheek" was deliberately hyperbolic and was more of a challenge than a literal command that we forgive people who murder our children...and aren't sorry!)
headline totally wrong. As article clearly indicates, she still retains her faith in God.