Two different religions in a society can create conflict because they can fight for territory and start a big war. For example, the crusades were because the christians, the muslims, and the jewish all wanted jerusalem for themselves because it was holy ground for all of them. Also, it can cause conflict because sometimes both religions want to convert people to their religion. For example, the holocaust was because Hitler wanted all the world to be christian.
Two different religions in a society can create cooperation because can help each other by teaching them what they know in exchange of the same thing. For example, the bahai religion did a course that taught people from different cultures and religions the basic way they see life. This means that bahai is trying to be nice and help other religions.