The impact of global progress has actually led to the rise of issues of radical ideology, such as the extreme right and extreme left movements, and even secular and caliphate ideologies, each of which undermines the Unitary State of the Republic of Indonesia. Lairan right is a fundamental ideology that always adheres to a textual understanding that does not want to accept the reality of globalization, social change, and advances in technology and information. Meanwhile, the left is the exact opposite, abandoning the religious frame and demanding the modern world as a whole, which then becomes extreme, even secular. What is interesting to study is how to modernize Islamic boarding schools in instilling idealistic values in students to overcome secularism? The purpose of this study is to understand the forms of modernization in Islamic boarding schools and the application of Islamic Boarding Schools as a fortress of the Ummah in instilling the values of idealism that are steadfast in overcoming secularism in religion. This research is a field research (field research). That is research conducted by looking at the reality of the field. The danger of secularism in religion in the context of the Unitary State of the Republic of Indonesia. As already mentioned in chapter four, efforts to optimize the role of Islamic boarding schools in countering radicalism and terrorism can be done by increasing the insight of pesantren through more comprehensive studies that do not only concern aqidah and fiqh thoughts but also philosophical and Sufism thoughts. Islamic boarding schools also need to be introduced to a theology that is more inclusive, accommodating and more tolerant. The development of a democratic culture that gets high support from Islamic boarding schools needs to be maintained and further developed by strengthening the theological reasons that can be used. Islamic boarding schools also need to be developed as centers of culture and economic growth so that pesantren can feel more integrated with the surrounding environment. Islamic boarding schools instill idealistic values in overcoming secularism in religion. Both modern Islamic Boarding Schools and Salafi Boarding Schools or a combination of the two, actually do not teach radicalism by distinguishing between religion and the state, instead teaching idealism values that become sadd al-zari'ah which can counteract radicalism.

Sadd al-Zari'ah, Secularism