Help Wanted: What is the Primary Source for This Quotation of Bertrand Russell?


From time to time I run across the familiar story about Bertrand Russell being asked how he would justify his nonbelief if he were suddenly in the presence of God. According to the story, Russell replied, “I’d say, ‘Not enough evidence, God, not enough evidence!”

The earliest source I have been able to find for this quotation is:

Wesley Salmon, “Religion and Science: A New Look at Hume’s Dialogues.” Philosophical Studies 33 (1978): 143-76 at 176, n. 20.

Does anyone know if Salmon’s article is the primary source?