God sent you to be a witness to those in your own community...My church does not so how can I witness to them? .
...by community I mean those you have a personal connection to
John, you are not responsible to witness to the whole world, God gave that responsibility to the whole church.
Be responsible to those near you, those that God gave you a personal desire to reach.
I commend you for your desire and willingness to share the Word of God.
I personally think you should narrow your focus and personalize the message you send to others, showing love to each and bathing your efforts in personal prayer for each individual.
Writing letters is impersonal and unfruitful.
Rob