In my opinion it does not matter what you consider Jewish or Non-Jewish. Everything in this world is a tool for us to go higher in ruchaniyut. Either something pushes you up or pushes you down-there is no in the middle. So obviously songs about love,boys, and kal vachomer worse things should not be listened to. But there are many songs with chizuk in it and do not involve any under linings of christianity, love, or worse. You need to judge for yourself what brings you higher. If a song does not bring you to serve your creator more than it isn’t good.
A good way to test if a song is good is to listen to it, and daven 5 minutes later mincha.
Are your thoughts pure? Can you concentrate? Do you feel it’s easier to talk to hashem?/