1. Makes you more accepting of beliefs based on authority than on evidence and logic. "We believe because the Bible says so." 2. Makes you adverse to science and other fields because their theories conflict with your beliefs. 3. Keeps you studying one book all your life and so keeps you ignorant about the rest of human knowledge. 4, Habituates you to believing whatever makes you feel good. 5. Elevates blind faith to a virtue to be cultivated. 6. Keeps you from questioning by condemning doubt as a sin. 7. Surrounds you with like-minded believers where your beliefs will never be challenged. 8. Lessens one's respect for education and learning new things. 9. Makes you accepting of illogical and irrational propositions. "God is three persons in one." 10. Elevates infallibity to a virtue.