I'm unaware of this debate. To deny that DNA mutations are integral to the theory of evolution would show complete ignorance of its fundamental principles.
No... evolution can theoretically happen without gene mutation. You know why? Because evolution doesn't deal with the beginning of life, it deals with life once it is already there. If a ton of life forms were created spontaneously (by God, or whatever you choose), then no gene mutation is needed for evolution to occur. Evolution is not by itself a process, but the result of a process. This process is natural selection. Do I need to explain this?
Lets say a three species of animal were created spontaneously by God. None of them experience any gene mutation, ever. Evolution can still occur, in this fashion. There are placed in an environment in which a species that has thumbs would have the upper hand.. The three species are an ape, a mole, and a mouse. To start the population out, we will say that it is 40% Ape, 20% Mole, and 40% mouse. Lets wait 200 million years and check the populations again.
The population is now 90% ape, 8% mole, and 2% mouse. This population has undergone evolution, but no gene mutations had occurred.
Even though this scenario is by far unlikely (as creation is virtually impossible), do you still at least get what I am trying to say?