“So by what scientific logic do you change the estin here to mean ‘represents’? Is means is.”
Scientific logic doesn’t come into play at all, since we’re not doing a science experiment. The things that are applicable are grammar, syntax, context, and semantics. I’m sure that you understand these concepts of human language, since you are using them. So, since you must understand that context and the like matter when interpreting statements like “x is y”, you must have some other motive for bringing up these irrelevant arguments. What is it that you are really meaning to get at?
Just agreeing with the Pope whe he said "The Bible isn't meant to be a manual of natural science," the pope told the estimated 5,000 visitors and pilgrims gathered for his audience. "Instead it is meant to make understandable the authentic and deep truth of all things," he said.