Originally Posted by Hutcho
Religion itself is agumentum ad ignorantia.
In these kind of discussions it is important to make sure we're all speaking the same language and using terms in the same way. I will assume here that by "religion" you mean "faith in God or the existence of God."
If I'm incorrect in what you mean, I apologize and hope you'll clarify. However, if that is what you mean, then:
Except that "religion" isn't so much an argument as a faith proposition. There is something proposed (e.g., the existence of God, etc.) that cannot be proven (or dis-proven) in the traditional ways we prove and disprove things but for which there appears to be some evidence and some people accept this proposition on faith.
Indeed some people do argue (or appear to argue) that God is real. And these can be good and interesting discussions, but his existence cannot be proven or dis-proven so, ultimately, any proposition on his existence is one of faith (perhaps with reference to things that one considers evidence supporting this faith.)
If I say: "I believe there's a God." or "I think God exists." or "I believe in God and he does this and that but not the other and has these properties and characteristics." I'm not so much making an argument as declaring a position or proposition of faith.
That being the case it ("religion") is not, properly understood, an argument from ignorance because it is not really an argument to begin with.