A person may decide to accept any religion as an adult. However, if he was not brought up in an appropriate cultural context, he may not know how to do it. Each religion, for example, for Islam, has its own conditions.
Islam is a religion that adheres to the policy of proselytism, that is, the promotion of its teachings and the attraction of new believers. This simplifies the task for a potential Muslim, but, nevertheless, for the full adoption of this faith will take time and knowledge.
To get started, contact the nearest mosque. Many of them have courses on the study of the Koran, including for those who are just planning to become a Muslim. Such training is not considered mandatory, but highly desirable, since even before the adoption of the faith, it is necessary to understand what Islam is in the form of dogma and daily religious practice.
First of all, focus on the study of the “pillars of faith” - the basic principles of Islam, as well as on daily religious practices. For example, Islamic prayer, unlike Christian prayer, is strictly regulated not only in time, but also in form. It implies not only the utterance of a religious text, but also a certain number of nods, and also requires special training, for example, ritual bathing. Keep in mind that the adoption of Islam will affect your daily life. Learn the concepts of permitted and forbidden in this religion, as they relate not only to behavior, but also to clothing, food and other aspects of life.
If you are married, seriously discuss your decision with your spouse, especially if he is not a Muslim. According to Islamic law, a man can be married to a Christian woman or a Jew. In this case, the marriage of a woman with a heterodox is not allowed. Keep in mind that even in an acceptable case, differences in religion in a marriage can lead to conflict and misunderstanding.
When you feel internally ready, and the mullah with whom you talked will support you, you can become a Muslim officially. To do this, it is necessary to pronounce the shahada - a testimony of faith - in the presence of two Muslims. The text can be pronounced in Arabic or native language. It is advisable to memorize it, but you can also repeat the words behind a mullah pronouncing a canonical text. After that, you will be considered officially converted to Islam, you will be able to pray in the mosque and follow other religious instructions.
The ritual of pronouncing the shahada is the same for all future Muslims. It does not matter if the person belonged to another religious denomination. An official "exit from Christianity" is not required - pronouncing the shahada is enough to be recognized as a Muslim.