For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
Giving to missions who are preaching the gospel, First Corinthians 15:3-4 is a good thing.
Our mission is to get as many people in to heaven as we can.
First Corinthians 1:18 For the preaching of the cross is to them that perish foolishness, but unto us who are saved it is the POWER of God.
First Corinthians 1:21 For after that, by the wisdom of God, the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe.
We can only preach the gospel. People have to believe the gospel by their own free will to be saved.
Galatians 1:6-9 Though we or an angel from heaven preach any other gospel unto you than that we have preached unto you, let them be accused. As we said before, so say I again, if any man preach any other gospel unto you than that ye have received from us, let him be accursed.
Make sure the missions you give to are preaching the gospel of salvation by grace apart from any works. The free gift of God by faith alone in Jesus alone plus nothing minus nothing.
The simplicity of the gospel that Paul preached. Acts 16:31 Believe on the Lord Jesus Christ and thou shalt be saved and thy house. What could be simpler than just believe and be saved. John 6:47. First John 5:13 John 3:18.
Those that believe it and accept Jesus free gift of eternal life are saved. Those that hear the gospel but do not believe the gospel are not saved. Romans 6:23 For the wages of sin is death, but the GIFT of God is eternal life, through Jesus Christ our Lord.
Ephesians 1:13-14. Our guarantee of eternal life. Ephesians 4:30. And grieve not the Holy Spirit in whom ye are sealed unto the day of redemption.
Be sure your money is going to preach the gospel. Not another gospel that cannot save.