1. Contrary to the dispensationalists’ claim that their system is the result of a “plain interpretation” (Charles Ryrie) of Scripture, it is a relatively new innovation in Church history, having emerged only around 1830, and was wholly unknown to Christian scholars for the first eighteen hundred years of the Christian era.
This is a rather weak argument.
Just because something was not discussed by early Christians means absolutely nothing.
We need to go to Scripture itself to determine whether Dispensationalism is true. The very fact that there is one called "the dispensation of the fulness of times" (Eph 1:10 KJV) is sufficient to indicate that there are other dispensations:
That in the dispensation of the fulness of times he might gather together in one all things in Christ, both which are in heaven, and which are on earth; even in him:
This is a reference to the future Kingdom of God in the New Heavens and the New Earth. "The fulness of times" means that all the various ages allotted to mankind have been completed.
Dispensations generally correspond to the various covenants, and during each of those periods, God was dealing with mankind in specific ways. That is really all that is involved. But because Dispensationalism reveals that Covenant Theology is unsound, those who hold to Covenant Theology (which includes Replacement Theology) hate Dispensationalism. The Church and Israel are separate entities as we can see even in Romans 11.
Paul refers three times to a "dispensation" of the grace of God which was given to him -- 1 Cor 9:17; Eph 3:2; Col 1:25. What does this word mean? The Greek word is oikonomia and here are its meanings -- stewardship or administration:
Strong's Concordance
oikonomia: stewardship, administration
Original Word: οἰκονομία, ας, ἡ
Part of Speech: Noun, Feminine
Transliteration: oikonomia
Phonetic Spelling: (oy-kon-om-ee'-ah)
Definition: stewardship, administration
Usage: management of household affairs, stewardship, administration.
So now one needs to ask:
1. Was Adam given a stewardship? Absolutely
2. Was Noah given a stewardship? Absolutely
3. Was Abraham given a stewardship? Absolutely
4. Was Moses given a stewardship? Absolutely
5. Was Jesus given a stewardship? Absolutely
6. Was Paul given a stewardship? Absolutely
In fact the stewardship of Christ extends from His time on earth, through the Church Age, through the Millennial Kingdom, and into eternity. And when His stewardship is complete, He will hand back all things to God the Father.
Then cometh the end, when he shall have delivered up the kingdom to God, even the Father; when he shall have put down all rule and all authority and power. (1 Cor 15:23)
As we can see, any and all attacks against Dispensationalism are just nonsense.