Kanskje det finnes noe bevis
A study of 788 people in the UK, France and Spain concluded that atheists and agnostics think of themselves as more open-minded than those with faith, but are are actually less tolerant to differing opinions and ideas.
https://www.independent.co.uk/news/science/atheists-agnostic-religion-close-minded-tolerant-catholics-uk-france-spain-study-belgium-catholic-university-of-louvain-in-belgium-a7819221.html