Stevie, I will attempt to answer your questions.
First of all, the 'other' sheep Jesus is referring to in that passage is gentiles. (He came for the lost sheep of Israel, but they rejected him so he invited those to the banquet who were not originally invited)
Secondly, being a child of God does not depend on religious affiliation, how kind you are to the poor, or if you have achieved a certain level of good works. The basis of salvation is Christ and Christ alone. We are all guilty before God because of our sin but Christ has purchased us with His blood, those who follow Him. 4 years ago I cried out to God to save me and He did. I turned from my life of sin to follow the Savior and He took away my heart of stone and gave me a heart of flesh. I live to serve and to please God and it is what I live for. Not in a religious 'works' type thing, but rather He has made His desires, my desires. I have been born again as the Bible speaks of. The body of Christ is an invisible union that people all over the world have with Christ, doing the will of God all over the earth. Not some legalistic Pharasaical organization based on 'towing the line'
Penn
Please email me if you want to talk or have any other questions :)
Jesus said "I am the Way, the Truth, and the Life. No one comes to the Father but by Me."