Please post what other information you have.
Do you know the names of his parents? Have you found a birth or death or marriage certificate for him?

Here is what I found:
He is mis-spelled in WWI draft registrations index:

Name: Abe Catlin
City: Not Stated
County: Gwinnett
State: Georgia
Birth Date: Nov 11 1885
Race: Black
Roll: 1557071

Listed as living in Walton County
nearest relative - Pearlie

1910 census:

Name: Abe W Catlin (record says Obe)
Age in 1910: 25
Estimated birth year: abt 1885
Birthplace: Georgia
Home in 1910: Brooks Dist, Walton, Georgia
Race: Colored
Gender: Male
wife Pearlie - married 4 years
daughter Luna M 3
son Grady 2
sister - cannot read surname - looks like Sallie or Sadie (?) 14

1900 census:

Name: Obediah Catlin
Home in 1900: Buncombe, Walton, Georgia
Age: 15
Estimated birth year: abt 1885
Birthplace: Georgia
Race: Black
Relationship to head-of-house: Hireling