This is the main thing that doesn't work for me. Stealing it, I get. But even if they intercepted the transfer, stole the code, and ruined his announcement, how would he not have a backup? That seems unlikely. I'm sure they'll somehow recover it, given the friend suggestion at the end, but that feels like a big hole to me.
Regardless, I still liked the episode. Loved the Miles/Arthur scenes, especially the faith discussion. I'm glad Miles acknowledged that who's behind it isn't as important as the good he's doing. I still don't see Henry Chase being behind the God Account, especially this early in the show (unless it's something where he created it but is no longer in control, as has been discussed here), so it will be interesting to see what happens next episode.