The difficulty everyone face of their own persuasions is the sharing of same wisdom, only in the context of their vocabulary.
Everyone is equal in that we all share same access to divine knowledge. However differences in experience allow us to identify all same notions under different vocabulary.
I see none other persuasion than Hinduism to have the proper inclinations necessary for uniting people.
The part which is missing and a part that Hinduism very well allows, is the freedom to express same thoughts but under different vocabulary.
I think we ought to not promote Hinduism but promote Hindu thought, and in a context that can relate to people of different persuasions.