That would depend upon the denomination or sect within Christianity. Could be as few as 1 and as many as thousands.
Depends on how many people are in the clergy.
I have seen nothing in the Bible to say that people must get married by ordained clergy, and there are many stories in the Old Testament that attest to people getting married without clergy.
The two types of clergy were regular clergy and secular clergy. Regular clergy were those who were in monastic orders, and so were regulated by the rules of those orders; they included monks and abbots. Secular clergy were those who served the secular population; they were deacons, priests, and bishops serving the secular people, or people who were not clergy.
It was common for the brightest child of a family to become part of the clergy. Many different people of different lifestyles also take part in some callings.
The church is not a building but a group of people and has been divided into the clergy and laity and now we have many divisions.
The First Estate, the Clergy made up approximately 1% of the French population.
The clergy could administer the sacraments, so everyone who hoped to gain salvation depended on clergy to help them.
the clergy had a key role in attaining salvation for the common people because the clergy were the only part of the church that could give the 7 sacraments, such as baptism and the lords supper. These were ways that people could gain God's grace.
nobles & clergy
Many residents of the Vatican are members of the clergy who do not marry. Some employees, such as the Swiss Guard, no not marry.
Republic of Virtue
They're clergy people