‘And Jacob's anger was kindled against Rachel, and he said, “Am I in God's place? Who has withheld from you the fruit of the womb?”
Rachel's accusations stir up Jacob's anger. He too no doubt feels frustrated. So he reacts with an outburst. He points out that it is God who is withholding a child not him. There is possibly a hint that Rachel is somehow to blame.
“God”. The word is Elohim. Failure cannot be laid at the door of God as Yahweh. Indeed from now on the whole passage uses Elohim until we reach Rachel's vindication in the bearing of a blood child (Genesis 30:24). What happens is no longer looked on as the direct intervention of Yahweh (compare Genesis 29:31), it is more pious comment.