A more thorough explanation:

Definition: A system of faith and worship that usually involves belief in a supreme being and a moral or ethical code. It is often recognized and practiced by a particular church, sect, or denomination.

Examples: Christianity, Islam, Judaism, Hinduism, Buddhism, and many other belief systems are considered religions.

Explanation: Religion is a set of beliefs and practices that help people understand the meaning and purpose of life. It often involves a belief in a higher power or divine being, and a set of moral or ethical principles that guide behavior. Religion can be practiced individually or in a community, and it can be a source of comfort, guidance, and inspiration for many people.

The concept of religion is often used in legal contexts, such as in cases involving the Establishment Clause and the Free Exercise Clause of the US Constitution. Courts have interpreted the term religion broadly to include a wide variety of theistic and nontheistic beliefs.

State religion refers to a religion that is promoted, taught, or enforced by a government's acts to the exclusion of other religions. This can be seen in countries where there is an official state religion, such as in Saudi Arabia where Islam is the state religion.