Today, one of the problems of the Islamic world, which has caused the issue of Islamic awakening to be challenged, is the growth and development of a destructive phenomenon called takfir. And in order to solve this problem of the Islamic world, it is necessary to make a united effort both in the field of theoretical issues and in the field of defensive approach. Of course, it is not a secret that the basis and principle of the work is to create enlightenment and critique and study this phenomenon from different perspectives such as jurisprudential principles, beliefs and theology, takfir from the perspective of the Quran and Sunnah, and so on.
In this article, an attempt has been made to study the phenomenon of Takfir with a theological approach and especially relying on the views of Sunnis, and considering the existence of common views in the basic principles and foundations among all Islamic sects, it has become clear what the place and effects of the phenomenon of Takfir are. And it has consequences for the Islamic world, and in this regard, issues such as the criterion of infidelity and faith, ways to deal with it, the difference between takfir in the beginning of Islam and the present era, the sanctity of colonial domination, etc. have been addressed. And among the results of this study were that; Firstly, one of the main reasons for the growth and development of this deviation within the Islamic world is due to public ignorance of the teachings of Islam which will have no fruit other than weakening the Islamic world and destroying and degenerating it and creating a challenge to the Islamic awakening in the present age.