@Thomas,
My understanding is that people who go through the trouble of annulling a marriage do so because they want to remain in the church (and perhaps have the church approve of their new marriage). Once you decide to leave the church, why would you care at all whether the church approved of your divorce or not? I am not a part of the church and I certainly don't care.
This is why annulling a baptism doesn't make any sense to me.
I was just thinking, I was baptized twice in my youth into denominations that don't accept each other. I suppose I am probably on two lists. Technically I am still saved with the Baptists who believe once saved always saved. I haven't believed in salvation for many many years and I don't see why I should care.
If after my death I find out there is actually a heaven when I wake up there, I suppose I won't complain.