And I have to add one more thing here, The call to the unity of relegions is a dangerous call brothers and sisters in Islam be aware of that, it is really a fight against Islam and a gainst The Word of Allah, Allah said in his Holy Quran:
Bismillah Al-Rahman Al-Raheem:
84. Say (O Muhammad ): "We believe in Allâh and in what has been sent down to us, and what was sent down to Ibrâhim (Abraham), Ismâ'il (Ishmael), Ishâque (Isaac), Ya'qûb (Jacob) and Al-Asbât [the twelve sons of Ya'qûb (Jacob)] and what was given to Mûsa (Moses), 'Iesa (Jesus) and the Prophets from their Lord. We make no distinction between one another among them and to Him (Allâh) we have submitted (in Islâm)."
85. <b>And whoever seeks a religion other than Islâm, it will never be accepted of him, </b>and in the Hereafter he will be one of the losers.
86. How shall Allâh guide a people who disbelieved after their belief and after they bore witness that the Messenger (Muhammad ) is true and after clear proofs had come unto them? And Allâh guides not the people who are Zâlimûn (polytheists and wrong-doers).
87. 87. They are those whose recompense is that on them (rests) the Curse of Allâh, of the angels, and of all mankind.
88. They will abide therein (Hell). Neither will their torment be lightened, nor will it be delayed or postponed (for a while).
89. Except for those who repent after that and do righteous deeds. Verily, Allâh is Oft-Forgiving, Most Merciful. 3, Surat Al-Imran
The verses in bold are the words of Allah(SWT) and not ours, so if u preach any other different relegion it will not be accepted from u, so how then can we call for unity of relegions? There is only one relegion Islam, u accept u will be saved, u do not it is your own choice then face what Allah The great has prepared for u for punishment.
Wasalam