Today's skepticism a la Michael Shermer is nothing new. Neither is its selectivity.
[C. S.] Lewis called for agnosticism of a sort: “I do not wish to reduce the sceptical element in your minds. I am only suggesting that it need not be reserved exclusively for the New Testament and the creeds. Try doubting something else.”
That sentence encapsulates a significant strand in Lewis's apologetic. “Try doubting something else.” Become less sure of bogus certitudes that block access to the most important realities.
David Feddes, Missional Apologetics: Cultural Diagnosis and Gospel Plausibility in C.S. Lewis and Lesslie Newbigin, p. 154.