Check out Suleymaniye Cultural Information Center. This Centre is undoubtedly an NGO managed by volunteers who also operate In the Suleymaniye Mosque. They give free details about Islam as well as the Islamic tradition both equally In the mosque and in their Heart. They have an interesting presentation about Islam https://travisuhzuq.bligblogging.com/37465108/the-best-side-of-istanbul-personal-portfolio-wordpress-theme