Since ID has been deemed a religious belief and not a science, the problem has been the creation of a national religion, establishing a particular belief over others negating full and equal rights. Behind the spirit of the first amendment, equal treatment of religious beliefs should be kept and the national government not favor one over another.
Quote:According to The Congressional Register Madison, on June 8, moved that
"the civil rights of none shall be abridged on account of religious belief or worship, nor shall any national religion be established, nor shall the full and equal rights of conscience be in any manner, or on any pretext infringed." Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

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I believe this has been perhaps where it crosses the line. It may be that you are making reference to the underlined portion of the paragraph while ID can be seen as violating the emboldened portion.
The final version reverses the two thoughts:
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof;
The sequence of thought seemed to go like this:
James Madison, 1789-JUN-7 "The Civil Rights of none shall be abridged on account of religious belief or worship, nor shall any national religion be established, nor shall the full and equal rights of conscience be in any manner, nor on any pretext infringed. No state shall violate the equal rights of conscience or the freedom of the press, or the trial by jury in criminal cases."
House Select Committee, JUL-28 "No religion shall be established by law, nor shall the equal rights of conscience be infringed,"
Samuel Livermore, AUG-15 "Congress shall make no laws touching religion, or infringing the rights of conscience."
House version, AUG-20 "Congress shall make no law establishing religion, or to prevent the free exercise thereof, or to infringe the rights of conscience." (Moved by Fisher Ames)
Initial Senate version, SEP-3 "Congress shall make no law establishing religion, or prohibiting the free exercise thereof."
Final Senate version, SEP-9 "Congress shall make no law establishing articles of faith or a mode of worship, or prohibiting the free exercise of religion."
Conference Committee "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof."