Curezone has hundreds of forums of all kinds. Some are going to include new age thought as well as other religions, but when you say the cleanses are zen-like, I wonder which of the cleanses you are referring to. Some of us are strong Christians and have been on Curezone for a very long time. I see no discrepancy between living our faith and taking some olive oil and Epsom Salts to cleanse the liver or herbs to expel parasites.
A good guideline to follow in alternative health for Christians might be to determine whether the practice has some sort of spiritual involvement or if it is just plain natural ingredients to produce a cleansing reaction. Using herbs, clays, bio, ozonated water, electric medicine, etc., is hardly spiritual in nature and offers many benefis. Why should we not take advantage of the wisdom that God has given us to stay healthy?