The take-away I got from the OP was the premise that all religious belief is beyond the verifiable and therefore is it never appropriate to question or challenge someone's religious beliefs, that personally held religious beliefs affect no-one but the belief-holder.Mike. I can't present any statistics on how much influence religions have on a secular society, secular laws, etc, or the flip side on how much influence secular philosophy has on religious societies, but it is only most probable that both influence each other.
Think of the scientific method. A lot of people have this idea that religion and religious thought is against science and scientific thought. But that's wrong. The scientific method was developed by a person called Ibn Haitham and he was motivated by his religious background. And his scientific method influenced science as a whole. Martin Luther was motivated by his religious rebellion or "protest" and the church was against him with one reason being his influence on the organisation of society which influenced secular societies.
This will go on forever.
Anyway, I have a doubt I understood you properly. Can you please clarify your final question?
I take some issue with this position, in that what people believe informs the decisions they make as members of society and can't help but have impact beyond themselves. And as the number of people who share the same belief grow, the greater the influence on society.
If a belief is based on a fallacy and has significant social impact, how is one to address this? Religion in general impacts society on many fronts, including abortion, science education, school prayer, medical research, gender roles and trans-gender issues, etc.
If the argument is abortion is wrong because God said it is wrong, what is one to do but argue against God if one is in favor of abortion rights? If the bible says the earth is only 6,000 years old, what can one do but argue against the bible if a 6,000 year old earth is not supported by the facts?
If one wants a society that makes the best possible decisions base on the best available information that is continually improved and updated, then one finds themselves continually in opposition to religious belief.