Peter Ruckman:Dispensational Salvation-Examined&Refuted-Multiple Gospels?

In this broadcast we deal with Peter Ruckman or Ruckmanism the teaching that men were saved different ways other than By The Lamb of God which taketh away the sins of the World .
We look at Old Testament saints and the Tribulation saints as well.
Are there multiple gospels. We use the free booklet from David Cloud on What about Ruckman?