Are you looking for the undertaker or the “uppertaker”? Theological complexities certainly do exist. But the vast majority of the Bible is unmistakably simple.
Most “mainline” denominations subscribe to Covenant Theology: They believe they are the “new” Israel. But on close inspection, the Bible disagrees.
Does God know the future or does He just make allowances for what happens? An open theist’s answer to that question may surprise you.
Christ returned in A.D. 70, the Jewish people have no future, and almost all prophecy has been fulfilled. You don’t believe that? Then you’re not a preterist.
Gentiles need Jesus to get to heaven; Jewish people only need Moses. A synagogue teaching, you say? No, this Dual Covenant doctrine is in churches.