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Article:

10 Things You Should Never Tell Your Boss

Here Are Some Things Your Boss Never Needs to Know About You or Your Life

9. Religious Beliefs

It's against the law to discriminate against religious beliefs, but talking about religion too often at work is inappropriate (unless you work for a religious organization). 

If your job duties entail something that violates a religious belief, you should speak up. You do not necessarily need to be specific with your boss; you can simply indicate that the task at hand violates one of your beliefs. If possible, present an alternative or workaround.

We're all entitled to our personal religious beliefs, but remember not everyone is religious and a workplace is not a church. It's all about common sense. A Bible quote on your cubicle is no big deal, but proselytizing and trying to convert your coworkers is going to ruffle a few feathers and could potentially put your  job security on shaky ground.