Side note: One of the more annoying things that Christian's (and Muslims, don't know about Jews) do is claim that all the Gods of the people they run into are the same, and they are really praying to the Christian god, just with a different name.
I take them at their word, if they claim they are all praying to the same god then they are all praying to the god of this world.
Bible believing Christians would agree with you. The ecumenicals are not all praying to the same God as Christian Bible believers.
From what little I know of Orthodox Jews, I suspect they hold the same opinion regarding the ecumenicals as the Bible believing Christians. Also lumping the Bible believers in with the ecumenical crowd as being in error.
There will be no room in the tower for Orthodox Jews or Bible believing Christians.