Why is it that the choice among churches always seems to be the choice between intelligence on ice and ignorance on fire? (quoted by Brian McLaren in his book “Why Did Jesus, Moses, the Buddha, and Mohammed Cross the Road?”)
Religions are similar in some ways, especially concerning ethics. However, religions also are very different from each other. In fact, even different subgroups within any religion show vast differences. One of the primary ways in which religions differ has to do with the extent to which they are exclusive vs. inclusive.
One easy way to see that there are differences across religions is to examine membership trends. Although various indicators suggest that formal religion is in decline in much of the world, some conservative religions actually are growing, such as Islam and “non-denominational Christianity.” The declines are coming in more liberal religions. Since World War II, for example, membership in the historical “Mainline Protestant” churches (Episcopal, Lutheran, Methodist, Presbyterian) has significantly diminished in the United States. Similarly, approximately 4 in 10 adults raised Catholic no longer consider themselves “Catholic.”