'And who could comprehend a Supreme Being anyhow?' ('Alcoholics Anonymous')
A block I once experienced in the programme was thinking that I needed to understand God before I could make a decision to turn my will and life over to God. The truth has been simpler. I have taken the Steps, and the Steps revealed God to me, albeit in tiny fragments: I would not claim to understand God to any great extent—how could I?—but I understand more than I did before.
Insisting on understanding God before taking the Steps is like sitting in the dark insisting on understanding physics before switching the light on. It's much easier to understand the physics textbook when the light has been turned on.
Action first; insight second.