ANSWER:

Be proud of your religion and say it, it doesn’t matter what they think!

No need to write it in your work emails as this might be used against you 

QUESTION: We say inshallah when we refer to something in the future. should we also do this while conversing with kaafirs or sending out work emails? Is it sufficient if we say it silently under our breath? Its hard to explain everybody what the term inshallah means.