My question is more about how you attribute Hoyle's apparent error to his atheism (later agnostic deism) & to atheists in general. I'll wager that most cosmologists were believers, so if an overwhelming majority of them preferred the steady state theory, then this would include believers. Could it be just plain old fashioned reluctance to embrace something new & revolutionary?In the 1920s and 1930s almost every major cosmologist preferred an eternal steady state universe, and several complained that the beginning of time implied by the Big Bang imported religious concepts into physics; this objection was later repeated by supporters of the steady state theory.[42] This perception was enhanced by the fact that the originator of the Big Bang theory, Monsignor Georges Lemaître, was a Roman Catholic priest.[
[Hoyle] found the idea that the universe had a beginning to be pseudoscience, resembling arguments for a creator
Here's the thing....all people are subject to personal prejudices & agendas, both believers & non-believers. There will always be examples of each rejecting a theory because it doesn't fit their notions of how reality should behave. The most iconic example is Einstein's rejection of quantum mechanics' (which he helped found) probabilistic imprecision because God doesn't play dice with the universe. And at times, these same people can rise above these limitations.