Lol! Are the Church's "dialogue partners" told that? Do the leaders of the Jewish Community in Rome know that the Pope "dialogues" with them in order to convert them to Catholicism? Then why are they participating? Do you think they would if the Catholic Church were honest about why it participates in "dialogue?" So since they are participating are they being misled or lied to by the "one true church?"
All the same, the only religion that has ever compromised in all these dialogues has been the Catholic Church itself, which incorporates almost every liberal criticism into an internal change of some sort (only the first eleven chapters of Genesis being "mythology" seems to be non-negotiable).
Exactly how do the idols of the Assisi prayer gatherings teach hindus and animists about "the truth of the Catholic Church?"
I can see that Catholic theology, scholarship, and practice is not your area of expertise, my friend. Remember that everything Christians do is for the purpose of bringing the truth to others, whether a Christian is engaged in direct apologetics or simply befriending and reaching out to those around them, that others may see the light and love of Christ in them.
Also, I apologize if the first sentence in my last comment sounded condescending. Regarding theology and what you referred to in bringing up Genesis, I would recommend reading some Catholic apologetics on that, as that is not my area of expertise. I simply offer my opinion regarding how Christians ought to look at ecumenical dialogue. Take care.