You can pick the topic people are chatting about.
You can start a conversation about a funny experience you had over the weekend, for example.
Christians, it may not be uncommon for you to find yourself in a classroom or chatting with colleagues at a function where the topic being talked about makes you uneasy. A news station you like to watch is being criticized, a boss or teacher you feel is pretty fair is being made fun of, or the group is pecking at each other boredly. If you tend to find yourself in this situation on a regular basis especially, consider being one of the people who starts the group conversation.
You can start a conversation about a funny experience you had over the weekend, for example. You may not be the type of person who would normally start a conversation. However, trying to lead a conversation can be better for you and the people around you then repeatedly waiting for someone to pick a topic that drags down a nice person.
Even if you are not talking about religion, it is still morally good to try to start a conversation people can feel good about. It could be about cooking or your appreciation for a colleague or professor. When you do choose to talk about religion, your voice may be an inspiration for someone who wouldn't have heard the topic you chose spoken about by anyone else around them.