Agreed, Tolkien was definately inspired by Nordic (as he calls them) cultures and religions.
However, so is Roman Catholicism, which had become a mixture of Greek Christianity and Western-European/Roman religions, in order to appeal more to the pagans of Western Europe.
Think Christian holidays, which have replaced the Germanic ones, and still involve many pagan traditions. Eastern (Osterfest) for example, which involves the very pagan Easter-Bunny (fertility symbol), or Chrismas (Winter Solstice) with the pagan Christmas Tree and possibly Santaclaus. And obviously every holiday which date evolves around the moon/seasons.
So, even though the Bible speaks of Angels/Saints/Christ as beings obidient to God, its very possible Medieval people didn't intrepet it this way. Think about Christ on the Cross ("My God, My God, why have you forsaken Me?"), which may indicate they did have a free will and were responsible for there own actions. (Christ not being an ordinary Human, otherwise this would be obvious ofcours.)
It is also possible that Tolkien was a "Theosophist", believing that every religion has a center of truth and that they combine into the absolute Truth, though he would ofcours never admit this.