You're off to a great start with your new 5D Mk II! Those church shots are impressive! You are going to LOVE using the 5D Mk II on available light photography. Just jack up the ISO and go! I have even hand held as low as 1/5 sec and got reasonable keeper rates but that was using the IS on the 24-105 F4 L IS. It takes a bit of practice but you will be amazed what that sensor can see!