Some people change what they believe. 
Some people change what they believe. 

Religious conversion is when someone adopts new beliefs. 
Some religions try to find new followers. These are called missionary religions. Buddhism, Christianity, and Islam are three examples. Other faiths do not seek new members. These are called non-missionary religions. Judaism and Hinduism are two examples.
Different faiths have different ways to join. In Islam, a person says a special creed. 
Religious conversion is when a person adopts a new set of beliefs. This often means they leave one religious group to join another. A person might move between different groups within the same religion. For example, someone might move from Protestant Christianity to Roman Catholicism. This change can sometimes involve special rituals to show a new identity. People choose to convert for many different reasons. Some change because their personal beliefs have shifted. Others might convert for practical reasons, like avoiding taxes or military service. Some conversions happen because of marriage or even on a person's deathbed.
Religions can be grouped by how they find new followers. Some are called missionary religions because they actively seek new members. Buddhism, Christianity, and Islam are three main missionary religions. Other faiths are called non-missionary religions because they do not seek new converts. Judaism, Hinduism, and Zoroastrianism are examples of these faiths. Some traditions, like Confucianism or Taoism, are also seen as non-missionary. The idea of these two groups comes from a lecture by Max Müller in 1873. This way of looking at religions helps us see how different groups share their ideas.
Every faith has its own way of welcoming new members. In the Baháʼí Faith, conversion is often a simple matter of filling out a card. This card shows that a person accepts the teachings of Baháʼu'llah. Since there are no clergy, new members are encouraged to help the community right away. In Islam, a person declares a special creed called the Shahada.
Some traditions use water as a very important part of joining. In Judaism, the process can take one or two years. It often ends with ritual immersion in a natural body of water or a mikveh. In Christianity, baptism is a common way to be admitted into the faith. Some Christian groups, like the Latter Day Saints, have very specific rules for baptism. They believe it must be done by full immersion in water. 
Understanding conversion helps us see how people connect with their communities. It shows how ideas can change over long periods of time. For example, the Armenian Apostolic Church accepted converts from other faiths in the nineteenth century. Different groups have different views on how salvation works. Some believe in the power of free will, while others focus on the work of a divine spirit. Whether through a special journey or a simple declaration, conversion is a way people express their deepest values. It is a way for individuals to find a place where they belong.
Religious conversion is the process of adopting a specific set of beliefs belonging to one religious denomination. This often involves a person leaving one group to join another. A person might move between different branches of the same religion. For example, they might move from Protestant Christianity to Roman Catholicism. In many cases, conversion marks a total transformation of a person's religious identity. This change is often symbolized by performing special rituals. 
People convert for many different reasons. Some changes happen through free choice because of a shift in personal beliefs. Others are called secondary conversions or deathbed conversions. Some people convert for convenience or because of marriage. There is also forced conversion, where a person is made to join a faith. Historically, people have used conversion for practical goals. They might convert to avoid paying certain taxes. Others might convert to escape military service or to gain political representation. The act of trying to persuade someone to join a new belief system is called proselytism.
Religions can be categorized by how they interact with others. This classification was based on a lecture by Max Müller in 1873. Some faiths are called missionary religions because they actively seek new followers. The three main missionary religions are Buddhism, Christianity, and Islam. Other faiths are called non-missionary religions. These do not actively seek new converts. Examples include Judaism, Zoroastrianism, and Hinduism. Some traditions, like Confucianism or Taoism, are also considered non-missionary.
Different faiths have unique requirements for joining. In the Baháʼí Faith, conversion is often a simple matter of filling out a card. This card is a declaration of belief. It includes acknowledging Bahá'u'llah as the Messenger of God for this age. Converts must accept his teachings and intend to obey his laws. Because the Baháʼí Faith has no clergy, new members are encouraged to be active in the community. Even a recent convert might be elected to a local Spiritual Assembly. This is the guiding institution at the community level.
Christianity views conversion in three distinct ways. It can mean a non-Christian becoming a Christian. It can also mean a Christian moving between different denominations. A third type is a spiritual development called the "second conversion." Baptism is often the sacrament used for admission. In the New Testament, Jesus gave the Great Commission, which commanded disciples to make followers of all nations. Different groups have different views on how salvation works. Calvinism holds a monergistic view through the irresistible calling of the Holy Spirit. Lutherism is also monergistic but views the Word as resistible. The Arminian view is synergistic, which means it considers salvation resistible due to free will.
In the Latter Day Saint movement, baptism is a central requirement. It must be done by immersion to signify the remission of sins. This occurs after a person shows faith and repentance. Members believe baptism should only happen after an "age of accountability," which is eight years old. This means they reject infant baptism. The person performing the baptism must have priesthood authority. They must immerse every part of the person, including hair and clothing. If any part is missed, the ritual must be redone.
Islam has its own specific process for those joining the faith. Conversion requires declaring the Shahada, which is the Muslim profession of faith. It states there is no deity worthy of worship but Allah and Muhammad is His messenger.
Judaism involves a formal process known as gijur. This process can last for one or two years. It is the conversion of non-Jews into the Jewish religious and ethnoreligious community. The specific requirements depend on the denomination. The process is often finalized with ritual immersion. This can take place in a natural body of water or a mikveh.
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