Greetings Pilgram:

Please explain why John 1:12,13 alone disproves the doctrine of covenantal succession. I don't agree with this doctrine and agree with you that it is a serious error, but I'm missing why John 1:12,13 disproves it.

"But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God." John 1:12,13 NKJV

This passage is simply saying that when you receive the Holy Spirit (born again) you receive the right to become the children of God. "Received Him" is the result of "believe in His name." "Received Him" is the same as "born of God", which as I said means received the Holy Spirit.

I think you are trying to read something more into this passage than is there, but would appreciate your elaborating upon your understanding of this passage.