I assume whatever Church you belong to has 1 Corinthians 1:10-17. Our devotion to Christ makes us brothers, and to strive for family unity is a good thing.
Yes, I agree that unity is a good thing. But not at the expense of truth. There always have been and always will be false teachers in the church. It is dangerous to just pretend that this isn't so. And the type of mantra worship taught at Taize is not Scriptural. No amount of good feelings will change that.