This is not true. A therapist would be required to break confidentially if they became aware that their Client is going to harm themselves or others, or if they are mandated by law.
What someone already did in the past generally isn't reported.
You need more context to answer questions like that tbh. No Christian denomination is like another, so definitely some would find it distasteful to use God's name outside Church, but most people aren't like that lol. Most people just speak the same way you and everyone else does.