John Mather, a senior project scientist for the JWST maintains a blog where he sometimes addresses questions about the telescope and big bang theory.
https://www.edge.org/response-detail/27054
Mather has pointed out more than once that WMAP, COBE and Planck have all "looked" back farther than the JWST is capable of.
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The definitive work on Einstein and God/Religion was written in 1999 by Max Jammer, who was one of his closest acquaintances. Jammer exhaustively compiles Einstein's written statements on the subject, both public and private.
https://www.amazon.com/Einstein-Religion-Theology-Max-Jammer/dp/069110297X