According to David Barrett and team, there are 19 major world religious groupings in the world which are subdivided into a total of about 10,000 distinct religions. Of the latter, there were 270 religions and para-religions which had over a half million adherents in the year 2000 CE. Within Christianity, they have identified 34,000 separate groups (denominations, sects, individual unaffiliated churches, para-church groups, etc) in the world. "Over half of them are independent churches that are not interested in linking with the big denominations." 1
Even considering a single religion, Christianity, within a single country, there are often thousands of individual "Christian confessions and denominations." For example, Barrett et al. states that there are:
4,684 groups in the U.S. 3,364 in South Africa. 2,079 in Nigeria. 1,581 in Brazil. 1,327 in South-central Asia.Among other English-speaking countries, there are:
828 groups in the UK. 469 in Canada. 267 in Australia 175 in New Zealand. 2Probably the one area where religions differ the most is over the nature of deity. Various groups teach Agnosticism, Animism, Atheism, Strong Atheism, Deism, Duotheism, Henotheism, Monism, Monotheism, Panentheism, Pantheism, Polytheism, the Trinity, and probably some others that we have missed. More details.
Perhaps the next greatest range of beliefs are about the fate of people after death: whether there is simple annihilation, some form of energy-less existence as taught by the ancient Hebrews, Purgatory as taught by the Roman Catholic Church, Heaven or Paradise as taught by many religions, Hell which is also taught by many faiths, Limbo, reincarnation, transmigration of the soul, nirvana, an alternative world much like Earth, and probably some other places or states that we have missed.
There is also a great range of beliefs and practices among different religions over other theological beliefs, ritual, organization, family structure, personal sexual behavior, and other topics. For example, differences exist on matters such as: abortion access, adult celibacy, animal sacrifices. appearance factors (shaving, jewelry), birth control usage, calendar, clergy celibacy, clergy gender, clergy organization, meeting day, documentation, family power sharing, family types, gender of deities, homosexual rights, meeting place, nature of deities, nature of humanity, new year date, number of deities, origin of the universe, prayer, pre-marital sex, role of women, sacred texts, suicide, surgical modifications to the body, special clothing, symbols, etc. More details
To our knowledge, no two religions teach the same message or expect the same practices from their followers. One would be hard pressed to find two faith groups within the same religion which have identical teachings and practices. If a "true religion" exists, then it would probably have to be one or a few faith groups within one of the 10,000 religions. All of the other religions and faith groups would be in error.
Most religious groups teach that their own beliefs and practices are the only true set, and that all other faith groups contain some degree of error. For example, the largest single faith group in the U.S., in Canada, and in the world is the Roman Catholic Church. According to the Times News Service, a year 2000 statement by the Church titled "Dominus Iesus" implies that "Churches such as the Church of England, where the apostolic succession of bishops from the time of St. Peter is disputed by Rome, and churches without bishops, are not considered 'proper' churches." Only the Roman Catholic Church and the Eastern Orthodox Churches are "churches in the proper sense." They suffer from "defects." Dominus Iesus further states that religions other than Christianity are considered to be "gravely deficient." Their rituals can constitute "an obstacle to salvation" for their followers. 3,4
Other faith groups are either more inclusive or more exclusive than the Roman Catholic Church regarding the "truth" status of other faith groups.
Because religions are so different, only one could be the "true religion." Perhaps none are. Within the "true religion" there may be more than one faith group that are sufficiently accurate in their beliefs and practices that all could qualify as "true." The problem is how to find out which religion and which faith groups have this status.
Some methods of determining the "true" religion are:
Conduct an opinion poll: Unfortunately, beliefs differ around the world: In Saudi Arabia, the government claims that 100% of the population is Muslim. So there is probably a very high probability that a given citizen picked at random would firmly believe Islam is the true religion and that theirs is the true faith group. India is about 80% Hindu. There is a very high probability that any given citizen believes that their tradition with Hinduism is the true religion. The U.S. is about 75% Christian. The population in the American "Bible belt" is significantly higher than that. There is a very high probability that any given citizen in South Carolina, for example, believes that their denomination within Christianity is the true religion.It is obvious that one's personal beliefs about the true religion is largely a function of the country in which one happens to have been born, the area of that country, and the beliefs of one's parent(s):
If Jerry Falwell had been born in Saudi Arabia of Muslim parents, and obtained his religious education in that country, there is a near certainty that he would be promoting Islam today. If the late Sheikh Mohamed Mutwali al-Sharawilittle of Egypt, who was called "The Arab world's best known television preacher of the Holy Qur'an," had been born and raised by Southern Baptists in Dallas, TX, that he would almost certainly have promoted Christianity.One's personal beliefs and the certainty with which one holds them is an unreliable measure of truth, because they are largely determined by one's culture and the faith of one's parents -- both largely accidents of birth. So, an opinion poll might show what peoples beliefs are. But it would not be helpful in locating the "true" faith group.
Pray to God 5 and ask to be enlightened. The founder of the Mormon movement, Joseph Smith, did precisely this. Mormons believe that God and Jesus Christ appeared to him side by side, and told him that none of the then existing Christian denominations were the true religion. He was instructed to create a new denomination to restore Christianity to its first century CE purity before it fell into heresy.Unless God were to take the initiative, it appears that there is no way for humans to determine which religion is "true."
Note: The following are personal musings and are perhaps biased and lacking in objectivity.
There is often great wisdom in comic strips. In 1976, Charles Schultz had Snoopy write a book on theology called: "Has it ever occurred to you that you might be wrong?" In 1980, he had Linus ask his Sunday School teacher the exact same question. 7
Imagine the results if more people in the world realized the simple fact that there are over 11,000 religions in the world and that it is impossible with our present knowledge to find out which is the "true" one. An inevitable corollary to this belief would be that they would develop a degree of doubt that their religion is the only "true" one. People might be less inclined to oppress, discriminate against, murder or commit mass murder and genocide against people of other faiths such as has happened during the past decade in Northern Ireland, Bosnia, Kosovo, Macedonia, Cyprus, Nigeria, Sudan, Iraq, Iran, Pakistan, Afghanistan, India, Sri Lanka, Philippines, Indonesia, the U.S. etc.
Imagine the results if more people accepted their religion as the best faith for them, but at the same time recognized that there are other religions which teach about other deities, other systems of morality, other religious practices, etc. Yet almost all of them motivate people to lead better lives. There might be fewer people willing to defend their particular religion by oppressing or killing followers of other religions and spiritual paths.
ReligiousTolerance.org