Why is that not a reasonable challenge?

It is a reasonable challenge. But Muskets assertion cannot be simply disproved by statistics. Religion is not about where you build the new motorway. All polls can be and most often are skewed. I'll give you an example.

In polls as on any legal documentation, I find it easier to put "Roman Catholic" than "I don't really believe in any divine power but I am, at heart, a spiritual person who would like to think that I have done some good, will leave a legacy for my children and grandchildren, and some part of me will remain." I am pretty sure I am not the only one. It all comes down to what many have been saying - The divide is not simply religious vs atheist. There are as many, if not more, type of atheist as there are religious folk.

Cheers

DtG