SECTION 3. RELIGIOUS FREEDOM
The free exercise and enjoyment of religious profession and worship, without discrimination, shall forever be guaranteed, and no person shall be denied any civil or political right, privilege or capacity, on account of his religious opinions; but the liberty of conscience hereby secured shall not be construed to dispense with oaths or affirmations, excuse acts of licentiousness, or justify practices inconsistent with the peace or safety of the State. No person shall be required to attend or support any ministry or place of worship against his consent, nor shall any preference be given by law to any religious denomination or mode of worship.
(Source: Illinois Constitution.)
“IL has a weasel out clause:
SECTION 3. RELIGIOUS FREEDOM
The free exercise and enjoyment of religious profession and worship, without discrimination, shall forever be guaranteed, and no person shall be denied any civil or political right, privilege or capacity, on account of his religious opinions; but the liberty of conscience hereby secured shall not be construed to dispense with oaths or affirmations, excuse acts of licentiousness, or justify practices inconsistent with the peace or safety of the State. No person shall be required to attend or support any ministry or place of worship against his consent, nor shall any preference be given by law to any religious denomination or mode of worship.
(Source: Illinois Constitution.)”
Superseded by the federal U.S. Constitution, if a case re this issue ended up in the SCOTUS.