These are the “ologies” that have been invented by men, by the year the word was first introduced.
c. 1350-1400 Theology
The study of God and all divine things
1654 Christology
The study of the person and nature of Christ
1663 Angelology
The study of angels
1673 Pneumatology
The study of the Holy Spirit
1835 Eschatology
The study of last things (death, judgment, heaven, hell, end times)
1842 Ecclesiology
The study of the church
1855-1860 Mariology
The study of Mary
1864 Soteriology
The study of salvation
1875 Hamartiology
The study of sin
1924 Missiology
The study of missions
1989 Israelology
The study of Israel