Illinois constitution
Article I
Section 3

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.