The Wikpedia article on Interfaith Dialogue is a good read. Here's a passage I particularly like, about the preconditions for "constructive and enriching dialogue between religions".
- humility (causes a respect of a person's view of other religions)
- commitment (causes a commitment to faith that simultaneously accept tolerance to other faiths)
- interconnection (causes the recognition of shared common challenges such as the reconciliation of families)
- empathy (causes someone to view another religion from the perspective of its believers)
- hospitability (like the tent of Abraham, that was open on all four sides as a sign of hospitality to any newcomer).