As one of Gorman's readers, it has interested me to come across other scholars who have held to one or more of his propositions. Although Gorman's book was born out of his personal Bible study, there are many other confirming witnesses.
Note this entry in the The Condensed Biblical Cyclopedia. It was written by Ashley S. Johnson in 1896. Under the topic, "Creation," the author gives the following summary:
Date. The date of creation cannot be determined. The first statement of the book of Genesis places the time in remote and impenetrable antiquity.
Creator. The writer of Genesis offers no proof of the existence of Jehovah or of the fact that all things were made by Him. (Genesis 1:1-2; John 1:1-3; Colossians 1:15-17; Hebrews 1:10; Hebrews 11:3).
Light. The process of creation had probably been going on for ages before light was created by the fiat of Jehovah (Genesis 1:1, 3; 2 Corinthians 4:4).
Days of Creation. The fact that the creative work had been going on for unnumbered ages, leads the reverent student to the conclusion that the "days" were ordinary periods of twenty-four hours each, and that each product of Almighty power was finished and appointed to its sphere on its designated day. The phrase "evening and morning" occurs six times in the first account of creation, and it cannot be understood except in the light of the above statement.
Johnson, Ashley S. "Creation," Condensed Biblical Cyclopedia. Blue Letter Bible. 1 Jul 2002. 31 Aug 2008.