You're not saying that Peter and the apostles killed them and then said god did it, are you?
Because that is the atheist view and as a true agnostic you should be open to the fact that god actually did it and supported the actions of the apostles and punished the two for their sins and because god is good and all his decisions are just you cannot really make a case against christianity out of this unless you want to oppose god and be a sinner and that disqualifies your opinion anyway.

Also the fact that they had all things in common and got what they needed is what seperates them from the likes of Scientology where you just give and receive a load of hot air until your life is completely ruined.