I am stating a fact, Eternal life can not be lost, or it is NOT eternal life
either your brother was saved, and he still is (he is a prodigal)
or he was never saved, and thats why he left. (As per John) ( A DOG returns to HIS VOMIT)
WORKS MEAN NOTHING, many people act like christians, doesnot make them one. I am sure th people who left the churhc in johns day appeared to have changed lives also.
New International Version 1984 1 Corinthians 13:1-13 If I speak in the tongues of men and of angels, but have not love, I am only a resounding gong or a clanging cymbal. If I have the gift of prophecy and can fathom all mysteries and all knowledge, and IF I HAVE A FAITH that can move mountains, but HAVE NOT LOVE, I am NOTHING. If I give all I possess to the poor and surrender my body to the flames, but have not love, I gain nothing. Love is patient, love is kind. It does not envy, it does not boast, it is not proud. It is not rude, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. Love does not delight in evil but rejoices with the truth. It always protects, always trusts, always hopes, always perseveres. Love never fails. But where there are prophecies, they will cease; where there are tongues, they will be stilled; where there is knowledge, it will pass away. For we know in part and we prophesy in part, but when perfection comes, the imperfect disappears. When I was a child, I talked like a child, I thought like a child, I reasoned like a child. When I became a man, I put childish ways behind me. Now we see but a poor reflection as in a mirror; then we shall see face to face. Now I know in part; then I shall know fully, even as I am fully known. And now these three remain: faith, hope and love. But the greatest of these is love.
Romans 3:3-4 What if some did not have faith? Will their lack of faith nullify God’s faithfulness? Not at all! Let God be true, and every man a liar. As it is written: “So that you may be proved right when you speak and prevail when you judge.”