True believing Christians are those who came to repentance and were coming to God in faith, through Jesus Christ. Faith or lack of faith in the theory of evolution does not determine whether they are believers. Those who still believe that evolution will have to at least come to see it as theistic evolution, but with honesty to themselves they will see a conflict of that with the character of Yahweh God, the Creator who made all things. Everything was very good, coming from God's perfection, with no limit on goodness and compassion, whereas the theory depends on survival by competition with death of many creatures from the very beginning. God's goodness is contrary to that.