Charles Darwin threw out Christianity but he didn't want to talk about it.

Wikipedia - Religious views of Charles Darwin

Those opposing religion often took Darwin as their inspiration and expected his support for their cause, a role he firmly refused. In 1880 there was a huge controversy when the atheist Charles Bradlaugh was elected as a member of parliament and then prevented from taking his seat in the House of Commons. In response, the secularist Edward Aveling toured the country leading protests. In October of that year Aveling wanted to dedicate his book on Darwin and his Works to Darwin and asked him for permission. Darwin declined, writing that "though I am a strong advocate for free thought on all subjects, yet it appears to me (whether rightly or wrongly) that direct arguments against Christianity & theism produce hardly any effect on the public; & freedom of thought is best promoted by the gradual illumination of men's minds, which follows from the advance of science. It has, therefore, been always my object to avoid writing on religion, & I have confined myself to science. I may, however, have been unduly biased by the pain which it would give some members of my family, if I aided in any way direct attacks on religion."

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This is interesting:

Religious Belief By Charles Darwin

This is an extract from:

The Autobiography of Charles Darwin

1809-1882

With original omissions restored

Edited with Appendix and Notes
by his grand-daughter Nora Barlow. (1958)