The decline of the Han dynasty was contributed to by the following circumstances:
- Insufficient tax revenue
- Destruction caused by natural disasters
- Internal peasant revolts
- Attacks by powerful warlords
All of the provided factors played a role in the decline of the Han dynasty, except for the "establishment of state religion," which wasn't a significant factor in its decline. Therefore, the correct responses are:
- Insufficient tax revenue
- Destruction caused by natural disasters
- Internal peasant revolts
- Attacks by powerful warlords