What does "other Religion" mean on your Vote section

I decided to vote on whether the Constitution was a Christian document. However, I ran into a problem. You ask about my resident state, my gender, my political affiliation, and my religious leanings. You give me choices such as Roman Catholic, Evangelical Protestant, Mainline Protestant, Charismatic Protestant, I believe there was another choice, and then you give the choice of "other religion" and "no religion." What does "other religion mean"

I find this similar to the quandary a few have with the establishment clause. I am none of the choices you gave. I could have chosen, "other religion" but what does that imply. Does it mean I may be a Muslim, a Jew, a Hindu, or some other strange non-Christian religion? Unless you clarify what "other religion" means then how am I to know.

Fortunately, I know that "religion" in the establishment clause referred to different denominations of the Christian faith. This is easily found out by anyone doing research.