The inter-faith business is an exercise in deception and error. It is anti-Christian in that it attempts to rob Christ, the only Saviour of the world, of His unique position as the second person of the blessed Holy Trinity. It proposes an alternative way of salvation – which does not exist (Gal.1). It treats the death and blood of Christ as an unholy thing, and is a demonstration of rebellion against God.
Christians cannot with good conscience be involved in such activity unless it is with the sole goal of evangelism. Short of seeking the conversion of the participants it is an empty and spiritually dangerous thing in which to be involved.