Enough
I would respond
So you acknowledge that this is what your organization taught in 1989 but now you are saying that this doctrine has changed.
Can you provide me a quotation from your literature that demonstrates that this teaching has changed? If not, I can't accept that this fundamental doctrine has changed.
If you say now that Jesus shed his blood for all then he shed his blood for you. So do you partake of the symbol of his blood at the memorial?
Why not? His blood was shed for the forgiveness of sin. Have your sins been forgiven by that blood? ??? Or does your death pay for all your sins so that you really don't need the blood of the New Covenant to be applied to your life?
If you are not in the New Covenant, under which Covenant are your sins forgiven?