2 door sport coupe, drivers side, between the front of the roof and door, that holds the front roofrail molding in place, it's starting to pinhole from the inside. Would this be considered the "A" pillar?

Well, an "A" pillar is the post between the cowl and roof if that's what you're referring to. The "C" pillar is between the rear quarter and the roof, and if it was a sedan the "B" pillar would be the post at the center.