Conversation Guidelines for Schools and Academic Settings, developed by the Tanenbaum Center for Interreligious Understanding, provides useful steps for having respectful conversations about 9/11 and religion.
The Conversation Guidelines [1] is divided into five sections: 1) preparing for a conversation, 2) getting your content ready, 3) anticipating issues, 4) facilitating the conversation and 5) reflecting on the conversation.
Tanenbaum also offers extensive fact sheets on everything from Muslims in America to an overview of world religions. The supplementary fact sheets, resource lists and conversation questions can be found here [2].
Links:
[1] http://www.tolerance.org/sites/default/files/general/9-11 GUIDELINES - Schools and Academic Settings.pdf
[2] https://www.tanenbaum.org/prepareny