Unless it's impacting your work, leave it alone. If you'd feel justified over "moral" obligation, then your co-workers are rightfully obligated by their morals to:

• Come by your desk and distribute religious materials
• Tell you how you're supposed to behave in yours sexual, family, spiritual and other practices.
• Tell you how "morally" you're supposed to work less, work more, do the work of others, or not give a damn about others.

In short, live and let live.

Unless it's impacting your work, leave it alone. If you'd feel justified over "moral" obligation, then it's only justified if your co-workers happen to be equally obligated by their morals to:

• Come by your desk and distribute religious materials
• Tell you how you're supposed to behave in yours sexual, family, spiritual and other practices.
• Tell you how "morally" you're supposed to work less, work more, do the work of others, or not give a damn about others.

In short, live and let live.