This.  At least so long as the music is not a vehicle to further a hateful and violent agenda.

Perhaps that is the case in America.  But in India, there is certainly a separate category referred to as devotional music, which is basically songs in praise of God(s) and it's identified as such in record stores.  They may not specify HINDU devotional music but there's no need to as all the titles stocked by the stores in that category pertain to Hindu religious music.  And as far as I know, Christmas music is a distinct category over there and it's a bit difficult to argue that that has nothing to do AT ALL with Christianity because it is a Christian festival.  We do have Christmas holidays here because it's a sort of festive season and we treat ourselves to pastries and all that but we don't say any prayers because, all said and done, it's not OUR festival.

Religion is the main cause of wars in this world. It's good to mention it in the songs once in a while.

Just as religion/spirituality is a part of life in every culture (without exception), and thus mankind, it certainly should be included in music, but not in a Clericalistic way.

What I mean is I don't agree with music that's made for the secular sphere always having to center on sacred themes. For example, as a Catholic I think that the proper perspective for a Christian lay person would be that God's beauty can be found in the secular sphere as easily as the overtly sacred sphere (in churches and such) without necessarily even mentioning God himself.

That being said, I'd much rather listen to Jethro Tull and Yes sing about the beauty that can be found in secular life which comes from God than Neil Morse sing constantly explicitly sing about his Christian spirituality, especially since he is neither always in church or any kind of Cleric/Priest (except perhaps to some prog fans!!  ).