Captain Eric Ayiah and winger Ibrahim Sulley each scored twice to hand the Black Starlets a 4-0 win at Stade de Port-Gentil.
The win sees the two-time champions tie Guinea, who thrashed hosts Gabon 5-1 in the other group game, at the top of the table.
"I must also congratulate Cameroon for giving us a very good match, though we took our chances and won 4-0," Fabin said.
"Just as I noted during the pre-match conference, we are one united football family despite the fact that we won.
"Cameroon started well but the turning point was the first goal we scored; that gave our boys the confidence and they never looked back.
"It was when we scored the fourth goal that I knew that the match was won and lost."
Ghana play Guinea in their next game on Wednesday.
Three points in that fixture will seal qualification to the semi-finals as well as the 2017 Under-17 World Cup in India later this year.
"We want to focus on the next match and hopefully with a win, then we can talk about qualification for the World Cup," Fabin added.
Sunday's game marked Ghana's return to the championship after a four-year absence.
The Starlets' last title came in 1999.