I read Darwin gave up God after his daughter died (and he had trained to be a clergyman), so no, 'faith' didn't influence his work.

The quotes give a little insight into his relationship with religion.
He wasn't a tubthumper/zealot as is the trend, he simply 'could not be sure'.

The difference is science always has the big 'Why' hanging over its head (a healthy thing I'd say) whereas religion will tell you 'just because'.

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