The Oregon law is unconstitutional.
His majesty Anthony Kennedy will probably say otherwise.
By Oregon's own Constitution:
Art I, Section 2. Freedom of worship.
All men shall be secure in the Natural right, to worship Almighty God according to the dictates of their own consciences.
Art I, Section 6. No religious test for witnesses or jurors.
No person shall be rendered incompetent as a witness, or juror in consequence of his opinions on matters of religeon [sic]; nor be questioned in any Court of Justice touching his religeous [sic] belief to affect the weight of his testimony.
Art I, Section 34. Slavery or involuntary servitude.
There shall be neither slavery, nor involuntary servitude in the State, otherwise than as a punishment for crime, whereof the party shall have been duly convicted.