If only that were true unfortunately it is not
Article 7 of the civil rights bill applies here not the first amendment
(j) The term ``religion'' includes all aspects of religious observance and
practice, as well as belief, unless an employer demonstrates that he is
unable to reasonably accommodate to an employee's or prospective
employee's religious observance or practice without undue hardship on the
conduct of the employer's business.
http://www.eeoc.gov/policy/vii.html
Gee, I always thought The Constitution was the Supreme law of the land. The civil rights bill was an act of Congress. That the morons on SCOTUS choose to ignore that fact is their problem. Not arguing that it isn’t currently binding, just that the constitutionality of it is wrong.
BTW, how is it possible that an employer would have to allow workers time during the work day to pray, and yet workers can be prohibited from waring a crucifix?