As a Christian, every part of our life should reflect the light from our relationship with the Lord and leave a shadow. You don't have to be a Pastor or Missionary to share your faith with others. Use the game as an opportunity to fellowship with church members or neighbors. Sports can be a wonderful opportunity to share your faith with others. If you are with believers then you can share what the Lord is doing in your life and answers to prayer.
Salt is for seasoning.
Some people don't use salt and others tend to over-salt. Unfortunately some people won't even taste the food before they salt and pepper it. A little here and a little there to taste is much better then dumping the whole salt shaker on someone's head. If you are living your life with the Lord in control then people will see that there is something different about you. They will be drawn like magnets and hopefully you won't repel them by what you say.