I've had a number of conversations with Pemberton. One was about the Christ Myth theory, and another was about cosmicism (links below, and see my comments under Pemberton's articles, through the last two links).

https://medium.com/@benjamincain8/assessing-the-christ-myth-theory-6e3dac1de602?source=friends_link&sk=3c6a499a4e1ab6ef1f7ad425923f0c9d

https://medium.com/@benjamincain8/clarifying-and-debating-the-christ-myth-theory-e28a293bd4d5?source=friends_link&sk=7fa7ae236191f5fc755fcba7f50e2612

https://medium.com/@benjamincain8/clarifying-and-debating-the-christ-myth-theory-round-two-52f2bee8b934?source=friends_link&sk=3e4d040d89542edcd67c182df6d204c8

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https://graham-pemberton.medium.com/must-atheists-prove-theres-no-god-why-not-part-1-51ac2e80cb06

https://graham-pemberton.medium.com/must-atheists-prove-theres-no-god-why-not-part-2-f21a2bf9b067