How do we deal with 'them.' First, be strong in the word your self. The more you know bible, the more 'words' you will have to conquer the enemy of human souls.
Second, know why the extremist religion is 'too good to be true'...... know its weakness and know its limitations. One thing I know is that the extremist religion has absolutely NO scientific reality. None. Do not be fooled, the muslim religion DID NOT contribute to any works in math and science. Arab or wise men may have contributed, but the muslim religion contributed nothing. Here is a good link which shows why the religion supports no science: https://maria911.wordpress.com/2009/09/13/192/
Third if you own a businesses, especially a storefront business, or even a business that sells hardware supplies, you will need to post notices that say you do not do business with 'extremists'..... For example, post something along the line, we do not consider you a customer but a trespasser if you intend to take seriously writings such as Koran, Main Kampf, Carl Marx, John Lennon, Marilyn Manson and other sacreligious and ritualistic extremist beliefs. Even those who consider twisting words from 'holy bible' and labeling outsiders as 'heathen' or 'intollerant' are not welcome here. Your business and confusions about realities and protections of human life, especially the protections of the disabled, the lame, the lost, the poor, or even your self, and those outside of your realm of reality, allows us protections to stand against the 'bad wolf' in your soul that you are feeding. Take your ideas elsewhere. If you need help getting out of your 'cult' we can help you understand, but you must have a listening ear. All person's thirty five years and under will be asked questions regarding their beliefs and intentions if we suspect foul play.
We tolerate no foul play due to religious extremism. Luke 10:12 But I say unto you, that it shall be more tolerable in that day for Sodom, than for that city.
Or a simple notice which does not outline possible extremist beliefs could be read as follows: If we suspect that you may be using supplies for 'foul play' purposes due to extremist beliefs with religious or political or nonreligious or nonpolitical purposes, we reserve the right to consider you a trespasser.