Atheist philosopher Jonathan M. S. Pearce maintains that materialism is an article of faith (compared to idealism)

 Idealism was the position that C. S. Lewis adopted (not Christian theism) when he was persuaded by the argument from reason. 

Here. 

As for the role of idealism in Lewis's history, see here. 

RIGHT-WING CANCEL CULTURE

Obama: “Like if I tweet or hashtag about how you didn’t do something right or used the wrong verb, then I can sit back and feel pretty good about myself. ‘Cause, ‘Man, you see how woke I was? I called you out’.” “That’s not activism. That’s not bringing about change.”

RWCC: Sorry, Barack, you’re cancelled. You are part of the Left, and the Left supports cancel culture.

Biden: Black Lives Matter protestors have a concern about systemic racism that is well taken. But property crimes or acts of violence in support of BLM is still criminal, and should be punished by law.

RWCC: Sorry, Joe, you’re cancelled. You are part of the Left, and the Left excuses violence and looting on behalf of the causes it supports. It is only crimes on behalf of Donald Trump that are inexcusable.

Biden: I oppose Medicare for All. I defended my opposition to it in the primary campaign against its leading advocate, Bernie Sanders.

RWCC: Sorry, Joe, you’re cancelled. You are part of the Left, and the Left supports Medicare for All.

Biden: I oppose defunding the police. We need to fund the police more in order to better equip them to handle sensitive and difficult racial situations.

RWCC: Sorry, Joe, you’re cancelled. You are part of the Left, and the Left wants to defund the police.

Biden: Even though I support a woman’s right to choose abortion as a matter of law, as a Catholic I nevertheless believe abortion to be morally wrong.

RWCC: Sorry Joe, you’re cancelled. You are part of the left, and the left loves abortion, and wants women to shout their abortions.

Etc. Etc. Etc.

I keep hearing Biden (and Obama, and other Democrats) attacked for what they don't believe, and have said they don't believe, because we know they're on THE LEFT and hence if you vote for one of them, you must somehow support everything THE LEFT supports, even if you don't support it and the don't support it. Why?