NCSE should have a lot of say what goes in science textbooks AND religious organization should have NO say. As religion is not science. And religion is not allowed in public schools at all. Creationism is religion and is not science therefore not allow in public school textbooks. That is settled law in the United States.
Regarding the gap between the cutting edge of science and what is in textbooks, there needs to be a gap of say 2 to 3 years as the science consensus builds on new discoveries and insights. But more than a 3 year gap is too much as then textbooks are out of date and obsolete upon publication.
Dr Swamidass is a better person to ask. To me, the cutting edge is what I read in Science Daily tomorrow morning.