The scriptures in question,
Not every one who says to me, Lord, Lord, shall enter into the kingdom of the heavens, but he that does the will of my Father who is in the heavens. Many shall say to me in that day, Lord, Lord, have we not prophesied through *thy* name, and through *thy* name cast out demons, and through *thy* name done many works of power? and then will I avow unto them, I never knew you. Depart from me, workers of lawlessness.(Mat 7:21-23 Darby)
I take this to mean that people can claim to be God's representative, but if they do not follow His will, all the showy fireworks will come to nothing.
Then shall he say also to those on the left, Go from me, cursed, into eternal fire, prepared for the devil and his angels: for I hungered, and ye gave me not to eat; I thirsted, and ye gave me not to drink; I was a stranger, and ye took me not in; naked, and ye did not clothe me; ill, and in prison, and ye did not visit me. Then shall *they* also answer saying, Lord, when saw we thee hungering, or thirsting, or a stranger, or naked, or ill, or in prison, and have not ministered to thee? Then shall he answer them saying, Verily I say to you, Inasmuch as ye have not done it to one of these least, neither have ye done it to me. And these shall go away into eternal punishment, and the righteous into life eternal. (Mat 25:41-46 Darby)
...and what is God's will? That we do good to the least favored in our society. We must get down and dirty where people live. Again, lip service (But We Are The Only Organization Declaring The Proper Name of Jehovah) doesn't count.
Whosoever shall receive one of such little children in my name, receives me; and whosoever shall receive me, does not receive me, but him who sent me. And John answered him saying, Teacher, we saw some one casting out demons in thy name, who does not follow us, and we forbad him, because he does not follow us. But Jesus said, Forbid him not; for there is no one who shall do a miracle in my name, and be able soon after to speak ill of me; for he who is not against us is for us.(Mar 9:37-40 Darby)
In other words, it is impossible to do a good deed without being on Jesus' team. Whether you formally joined or not.