The forefathers of our nation decided to rebel against Britain because of the oppression of differing religions beliefs. As a result our Constitution was made secular, without reference to religion other than to proclaim the freedom thereof.
However, what was not considered is that there are some religious ideologies that believe they are the one true religion, and that everyone should conform to that religion. They also mistakenly believe they are doing everyone a favor by proliferating their beliefs.
You cannot serve two masters. You cannot serve the people and a demanding deity equally. Many ideologies insist that they serve their gods first, the people second.
To preserve the original intent of the founders of the Constitution then, those who insist they serve any other than the people that put them in office need to be excluded from holding any public office whatsoever. As far as I can see, this seems the only solution. Fundamentalists of all religions as well as any others that insist they serve a god before their constituents need to be barred from participating in the very government that protects their religious rights. This is the only way that the oppression the founding fathers fled can be avoided here.