Good:
- Useful social engineering tool; people are more likely to obey laws which they believe to be backed up by an omniscient force because they know they can't "get away with it".
- Comfort, especially for the young: I've thought about this, and if my son was dying of some terminal disease, and he asked me what happens afterwards, I might just tell him that he'll go to Heaven. Even though I don't believe it.
- Church is a good place to pick up chicks.
- Church proselytizing activities often involve community work.
- More group identifications, added to race and nation. More divisions between people.
- Encourages irrational thought.
- Encourages anti-scientific sentiment (often, but not always).
- May encourage abdication of personal moral responsibility to the edicts of a higher power, or more specifically, the church claiming to represent that higher power. In other words, people are often not encouraged to develop their own moral code independent of the faith.
- Some specific doctrines, sects, and cults are downright evil.
- Some churches accumulate vast sums of money to spend wastefully on their own glorification, eg- 100 million dollar church buildings