It is a fallacy to teach that the Bible never uses “Israel” to discuss the the combined twelve tribes.
Look at Jer. 31 the NEW COVENANT was made with 2 separate peoples, neither one being the church. So according to the New Covenant you are either Israel or Judah. It really gets fun and interesting when you start seeing this perspective.
FF Bosworth, a well known Evangelist during the 1920’s wrote that the greatest heresy perpetuated by the church was to dismiss the truths of the two houses of the Kingdom of Israel. He further stated that 5/7’s of Bible Prophecy could not be determined without these truths.