There are 3 big questions which need answering before a Christian will effectively impact his or her surroundings with gospel of Jesus Christ. The answers to the first two questions are objective and based on Truth (i.e. the Scriptures), whereas the last one is subjective and based on circumstances.
Q: What is a Christian’s purpose?
A: A Christian’s purpose is to glorify God: So whether you eat or drink, or whatever you do, do all to the glory of God (1 Corinthians 10:31).
Q: How does a Christian glorify God?
A: One way which a Christian glorifies God is through the exercise of his or her gift(s) in the service of others:
Above all, keep loving one another earnestly, since love covers a multitude of sins.Show hospitality to one another without grumbling. As each has received a gift, use it to serve one another, as good stewards of God’s varied grace: whoever speaks, as one who speaks oracles of God; whoever serves, as one who serves by the strength that God supplies–in order that in everything God may be glorified through Jesus Christ. To him belong glory and dominion forever and ever. Amen (1 Peter 4:8-11)
Since we’ve determined that our purpose in life is to glorify God through the exercise of our gifts, we now turn to the question that will help determine the particular context (i.e. church) of a believer’s ministry.
Q: Where can a Christian most effectively glorify God through the exercise of his or her gift?
A: A Christian can most effectively glorify God through the exercise of his or her gift within a local body of believers (i.e. body of Christ) who are united in mind & judgment:
“But God has so composed the body, giving greater honor to the part that lacked it, 25 that there may be no division in the body, but that the members may have the same care for one another. 26 If one member suffers, all suffer together; if one member is honored, all rejoice together. 27 Now you are the body of Christ and individually members of it” (1 Corinthians 12:24-27).
“I appeal to you, brothers, by the name of our Lord Jesus Christ, that all of you agree, and that there be no divisions among you, but that you be united in the same mind and the same judgment.” (1 Corinthians 1:10)
Even a superficial reading of the Scripture reveals that God is more concerned with who we are and what we do than where we go. Therefore, before you determine the context of your service, ensure that you are united in “mind and judgment” with the prospective church or team. And when you join, continuously remind yourself that God’s purpose for your life is to glorify HIM, and one way to glorify HIM is by exercising your gift in the service of others.