The New Testament church has the example of Old Testament history to inform us on the pitfalls of living in this fallen world. Just as the Jews repeatedly adapted the heresies and pagan ideas of the surrounding nations, the church was continually faced with the same dilemma, assaults from without, apostasy from within. Being culturally 'religious' and superficially spiritual feeds a human need for meaning, but falls short of God's plan of salvation. Incorporating false teaching into the Gospel and calling the mix Christianity is following Satan's lie. What better way to destroy a soul, than to convince him or her that they can hold onto heresy and still receive the blessings of God? It goes against the word of God, and it is a reason the Lord said judgement begins at the house of God.