on what your purpose is in your dialogue.

At large, for the sake of world peace, inter-religious dialogue is better than pure hatred, yes. That needs your participation but much more than your participation. However, keep in mind, that's not the purpose of our faith, is it?

So if your purpose is to get to know another faith and respect other peoples' faiths as they are, then your dialogue isn't really worth much in the next world; if your purpose is to spread the gospel to them, then God bless you.