"Denial of the existence of God as the creator is the crux of the whole issue."
Good, because evolution doesn't deny the existence of God.
"Government schools cannot allude to the existence of God when teaching evolution as this would be an illegal endorsement of religion. I see no difference between this and a denial of God's existence."
Why would someone allude to the existence of God when teaching evolution? The theory has nothing to say pro or con regarding God. Any more than the theory of gravity requires mentioning the existence or nonexistence of God.
Deny the actions of G-d, that is denial of G-d in all effect. One might ask what is so awful about allowing some scientists to pursue biology as it was designed?
correction: "as if it was designed."
Darwin himself said that he was observing and commenting on God's creation. Would you allow that to be taught in a public school class on his works? After all we cannot teach evolution without alluding to Darwin.