A person can't normally get punished for "sharing faith"...but should (and hopefully will, someday soon), if he/she is a commander, supervisor, or superior in terms of rank or position, and the "faith sharing" is mixed with official activities or official status, and/or is directed to subordinates who have no choice but to listen and who of course will believe they had better conform or suffer the consequences.
Absent that kind of abuse of position and absent interference with others' duty performance, "sharing of faith" (whether proselytizing or evangelizing or just religious banter and small talk) can't be singled out for restrictions or sanctions simply because it's religious--even if it's happening in the workplace. Where it becomes an actionable problem is when the person(s) to whom the religious speech is directed says "stop" and the proselytizing/evangelizing continues. It's actionable because it's now unwanted and potentially injurious to mission accomplishment, good order, & discipline (especially if in the workplace; there's obviously more latitude in a non-duty setting). The more senior the person indulging in the religious speech is in terms of rank or position, the higher the greater the risk that the speech won't be permissible speech between equals if for no other reason than that the "target of the speech" is less likely to be able to say, "Stop talking to me about that--I'm not interested!"