An article stated that the middle child has unique challenges to overcome. I contend that the first child and the last child and all of the other children have unique challenges to overcome. The idea that a position in the family hierarchy creates unique challenges may or may not be valid, however the discussion overlooks reality. We are all middle children, if you are a believer. There were many Christians who came before us who are older now and there are many behind us, especially if you have just become a Christian. All Christians are middle children. There isn't a better example of equality than Christianity. Jesus died for all, equally. He allows us to grow in fellowship with Him equally. He doesn't discriminate on any basis. Example, the Father "sendeth rain on the just and on the unjust". There you have equality spelled out in just a few words. God will save your soul by one means, Himself, and excludes nobody.
There is one opportunity for exclusion. Don't tell anyone about salvation through Christ.