What do you do about Christian songs or worship?
I work in a Christian environment. I am openly Jewish. Christian hymns and songs are regularly and communally sung here, sometimes as worship, sometimes as just singing.
My attitude has long been that I will sing when it's 'just' singing (I have sung a choral mass as a performance, for example) especially when it's a song that is not in any way contrary to Judaism, but I do not sing Christian worship songs when it is an act of prayer.
I'm happy to sing worship songs that are not in any way contrary to Judaism during a Christian prayer (23rd Psalm, for example, or He's Got The Whole World in His Hands).
Is this hypocritical? Does it matter?