According to the first Google result on the topic, "In 2020, 47% of Americans said they belonged to a church, synagogue or mosque", which means that your
"average American" is not actually reflective of the average American.
In 2021, only 41% of people claimed to attend a church or synagogue at least once a month [1]
[1] https://www.statista.com/statistics/245491/church-attendance...