In the Dover trial, Michael Behe said, under oath, that he thought the Designer was God. And based on his other public statements, it seems he meant the Christian God.
Be that as it may. After the statement about ID holding that the universe has a designer, one can simply drop the issue. It would only be the establishment of a religion if it went farther to state which deity, and any teacher worth their salt could avoid that argument. It would certainly be appropriate at that point then to say that that topic is not open for further discussion. The reason that I object to religion being TAUGHT in the school is that someone would need to decide which religion; Catholicism? Baptist? Pentecostal? Native American? I do object to excluding it and teachers and students should have the freedom to discuss religion without the fear of being accused of proselytizing.