Madist' ( some ) then believe as Ephesians 2:8,9 teaches ?
For by grace have you been through faith and that not of yourself it is a gift of God and not of works lest any man should boast.
Of the two Major schools of thought within the faith - Reformed and Dispensational - Mad is a school of thought within Dispensationalism.
There is Acts 2 Dispensationalism (known as Classic, or Traditional Dispensationalism).
The vast majority of Dispies hold to Acts 2 Dispensationalism, in one form or another.
And there is Acts 9, or Mid-Acts Dispensationalism, aka M.A.D.
And there is Acts 28 Dispensationalism...
And as with any group within both larger schools (Reformed and Dispy), Mads hold to different understandings within their own ranks.
For example, some Mads hold to a KJVO position.
Others do not.
Most Mads are not Calvinist; some are.
Others are Open view; a few others are neither.
Most Mads hold the Romans were in the Body.
Some Mads do not.
Most Mads tend to hold one should be fair in one's dealings with others.
Some Mads are both consistently insolent and "my way or the highway" with anyone who dares question their views.
Some Mads are Cessationist, others only assert they are.
Most hold to the Lord's Supper; some do not.
Most hold that Paul preached one gospel throughout his entire ministry; some hold he preached more than one.
Most hold that we are saved by grace through faith, not of works lest any man should boast, and the gift is salvation.
Some hold that gift is faith.
And so it goes; as with any school of thought, being that within all schools within the faith, people are bound to differ on one thing or another - because not only are people individuals and not some "assimilated...Borg drone" but each person's conclusions are bound to be impacted by where each looks at one thing or another from; each's personal level of experience and understanding as to how a thing is to be studied out, and so on.