"They are both essentially theologians in a non-Christian key. They have not yet begun to take the secularist, naturalist, scientific view of religion that, as I indicated in the first lecture, forms the substance of the discipline of religious studies. They were still doing religious thinking, trying to put forward a more universal theology that would meet the needs of an age of constant warfare." What does "key" mean here? Or perhaps I misheard the speaker. He might have said "keep" instead. Or maybe it was pronounced "key" but spelled in a different way.