Genesis 16:13 KJV
 And she [Hagar] called the name of the Lord that spake unto her, Thou God seest me: for she said, Have I also here looked after him that seeth me?
Hagar, an Egyptian servant caught in the midst of crisis in a ‘Christian’ family, must have been very disappointed about how God’s people were maltreating her etc. She could have been bitter and disappointed to the extent of denouncing the God Abraham and Sarah served. Yet, she called on the name of The Lord, just as she had probably seen them do. God did answer her. Christians are not superhuman; it is the grace of God. Don’t blame the Giver of grace for the mistakes of the receivers. We should not let the mistakes of some Christians dissuade us from worshipping the true God. We are only responsible for our own relationship with God, just as everybody else is responsible for theirs.