salaam,
Yes, I know what they're saying about Christianity is all true. It's nothing new - the explanation for the origins of Christmas and the divinity of Jesus have been around for a very, very long time. My point is, they obviously don't know the truth about Jesus, so you should also be questioning everything else the film is saying. It did nothing to weaken iman (nor did it strengthen it since the points it made are rather obvious and semi well known), I'm just very, very skeptical of things like this.
The dangerous thing about videos like this, is that they mix in just enough truth with just enough lies so that most people just glaze over it. I'm sure there are good points in it, and things that are true. But there are also plenty of lies in it. When I saw it awhile ago, there was a handful of fallacies that I picked out, and I wasn't even paying too much attention to it.