What Would You Say to Coworkers who Blaspheme Constantly?

Questions about how to put a stone in the shoes of coworkers who blaspheme constantly and whether it’s reasonable to think Jesus only had 120 followers before Pentecost.

• What’s a winsome way I can put a stone in the shoes of coworkers who blaspheme constantly to get them thinking about what they’re doing when they take the Lord’s name in vain?
• Is it reasonable to assume that the 120 gathered in the upper room in Acts 1:15 were the only followers of Jesus at that point in time before Pentecost?