AA is not "christian" in any way that would be familiar to a regular churchgoer.  It's founders were members of the so-called "Oxford Group", which held a peculiar set of quasi-christian beliefs in the early 20th century.  AA's theological underpinnings are more problematic - although ostensibly christian, there is no mention of Christ in any AA literature.

The biggest issue with AA is that it insists that alcoholics are essentially powerless and hopeless.  In my view, this is not a good underpinning for recovery from any addiction - in fact, to truly recover, you have to believe that it is possible, and that you are capable of accomplishing it.

AA may work for some (although there are numerous reputable studies that show it's effectiveness to be limited), but only at the cost of subordinating the individual to the AA group-think.  Not a particularly welcome choice in my mind.