In Greene's novel, The End of the Affair, what is the effect that WWII has upon Sarah?

After a V1 bomb blew up the front of the house where Sarah and Bendrix were, making love, Sarah prayed Bendrix might survive, and when he appeared in front of her, bloody but living, she felt bound by a vow to God. If Bendrix and Sarah were young, she might have made this leap of faith into marriage, but she is already married, and Bendrix is jealous and somewhat destructive. He wants a love that will go on and on, and she knows she cannot give it to him, on account of her prior marriage vow. So she makes the leap into religion and dies before Bendrix can try to convince her to run away with him.