Then Paul stood in the midst of the Areopagus and said, "Men of Athens, I perceive that in all things you are very religious; for as I was passing through and considering the objects of your worship, I even found an altar with this inscription: "TO THE UNKNOWN GOD." Therefore, the One whom you worship without knowing, Him I proclaim to you: - Acts 17:22-23
There are millions of souls on earth today that have some remnant of a belief in God but are doing nothing more than following superstitions, unable to "discern the true nature of God."
Instead of making an excuse so we can feel better about not approaching them right now, or at all, with the Gospel, we ought to see them in the same way we see the atheist, Muslim, Hindu or any other person who has not obeyed the Gospel of Christ. That is, we ought to see them as a soul on its way to eternal punishment and in need of the saving grace of Jesus Christ!