What if They Think Christianity Is True, but They’re Apathetic about Becoming Christians?

Questions about what to say to coworkers who are convinced Christianity is factually true but are apathetic about actually becoming Christians and arguments for those with a Reformed view who think apologetics isn’t necessary and is a waste of time.

• How do I do apologetics evangelistically, particularly for some coworkers who are convinced Christianity is factually true but are apathetic about actually becoming Christians?
• What are some good arguments for those who think apologetics isn’t necessary and is a waste of time, especially for those with a Reformed view?