Who Is Saint?

General views of society on what makes a person a Saint

1A. Criteria to be considered for Sainthood according to various religions

Depending on the religion or faith, there are many criteria that need to be considered in what makes a person a Saint. Also, the criteria to become a Saint for some religions have changed over time. To be considered a Saint various religions stipulate certain attributes or criteria which are included below:
A person must be righteous and virtuous.
The person must be from that particular religion.
Some religions require that the person has to have passed away and attained a place in heaven before they can be considered for Sainthood. Others acknowledge Sainthood as a state that can be achieved while a person is living too.
The person needs to have performed miracles while living and or after death. A miracle after death could include the body of the person not decaying or healings attributed to intercession of the Saint or contact with relics of the Saint.
The person needs to be able to intercede with God on behalf of people.

1B. Process of making a person a Saint
If a person meets the criteria of the religion in question, they generally go through either a formal or informal procedure of being proclaimed (canonized) a Saint. In some cases the formal procedure can last many years.
In most cases, the people conducting this formal or informal process are not Saints but just religious people or people of some standing in the religion or in some cases it is the popular vote of society.
Whichever the religion, people generally bestow the title of Saint only from that religion.
In some cases people become self-proclaimed Saints and also get mass following if they are able to display some supernatural powers gained through some specific spiritual practice.