The Blues defender's goal appeared to have put Alex McLeish's men on the road to a vital three points at bottom club Wigan on Saturday. However, the hosts stormed back to win the game 2-1, which leaves Birmingham down in second-bottom spot going into the international break.
The foot of the Premier League is tight this season and the Blues could jump up to 13th position if they win their game in hand, with Ridgewell confident they can get back to winning ways and pull away from the drop zone.
"All I can say is that this is madness, this league, absolutely crazy," he told the Birmingham Mail.
"I have never known a league to be like it is. Everyone seems to be winning when you don't think they will, and it clogs things back up.
"As long as it's in our hands, that's the main thing.
"When we got relegated last time [in 2008] it wasn't in our hands, so we have got to make sure it is now.
"We know we are good enough to stay in the league, we have got to believe in ourselves.
"It is about showing it and doing it, though - but I'm sure we will stay up."