It is relevant to my "disagreement and religious belief" topic. Certainly this argument has been expressed by others, but here is what I see:
1. There exists a just God (explanation of "just" to be discussed later)
2. All humans are created equal.
3. There is "one true religion" leading to salvation.
I argue that these three statements cannot all be true at the same time, in light of the fact that there is no equal proportion of followers to non-followers of any religion in the world. Evidence strongly supports the idea that members of any given culture have a strong likelihood of following the religion of their dominant culture.
The first premise:
Justice here refers to the principle that similar cases are to be dealt with similarly. A just judge would not look at two similar cases and give one preferential treatment over another - he would deliver a similar verdict in both cases.
If that is the case, then given a population of humans (all things being equal), each member of that population would be given similar treatment in a trial on the same charge/s.
The second premise:
"All humans are created equal" is an essential premise to the idea of a just God. If there is a way to argue that a just God could create two people and have one "better" or "more valuable" than another, I have yet to hear the argument.
The third premise:
Many - if not most - religious people expressly believe that there is just one "correct" religion, and that those who do not follow it are not favored by God.
Assume (1) and (2) are true. If there exists a just God and a population of humans created equal, then we would expect to see a similar ratio of "saved" people worldwide. Since we do not see such a ratio in any religion, we must conclude that there is no "one true religion." (3) is false.
Assume (1) and (3) are true. If there is a just God and there is one true religion, we would expect to see a similar ration of "saved" people to unsaved people worldwide. Since we do not see such a ratio in any religion, we must conclude that some people are privileged over others (either in knowledge or in internal qualities). (2) is therefore false.
Assume (2) and (3) are true. Well, that assumption cannot be made. If all humans are created equal and have an equal chance at salvation, and there is one true religion leading to salvation then we will observe a similar followers to non-followers of that religion worldwide. We do not observe this.
There is no possible situation, given the reality of what we observe, where premises (1), (2) and (3) are all true. Note that this does not suggest ~(1). It is possible for a just God to exist in this argument; that is not compatible with (3), the existence of "one true religion." The argument also does not suggest ~(3), but that if (3) and (2), then ~(1).