Firstly, be aware of each other's prayer concerns. Ask your roommates what their needs are. Make an easily updated list in a common room. Try putting a whiteboard up in the kitchen so that everyone can be kept up to date. And, of course, being aware of your roommates' needs isn't enough. You've got to actually be praying for them. Spend time everyday saying a prayer for each roommate. And let them know that you're praying for them, they'll be sure to remember you as well.
If you want to go a step further, you can have a weekly or even daily group prayer time. It doesn't have to be formal or anything. Just take two minutes a day to get together and pray for each other as well as for some common concerns. This will do wonders for your relationships with each other.
Finally, if your roommates are really fired up, you can host a monthly prayer event at your home. Invite other Christian friends and people from your churches. Cook a meal, have some fun, spend some time in worship, and pray together. You'll be doing a wonderful community service and opening up many avenues for Christians in the area. Don't put too much pressure on yourself to make it an elaborate event. Just keep it simple. The important part is the fellowship and prayer time, not your decorations or fancy dishes.
Making prayer the center of your relationship with your roommates will make a huge difference. Having a Christian support group at home is incredible and will change your life. Spend time praying for and with your roommates and you will see the change.
