It started off with Thomas, but you actually brought Judas into the mix by stating only the partial scripture of Jesus saying He did not lose one. I pointed out to you the rest of that scripture that showed He did lose one of His disciples, and that was Judas who betrayed Him.
As for Thomas is concerned I answered that, but let me post it to you in another way;
Do you believe in the Lord if you don't believe He came in the flesh ? NO
Do you believe in the Lord if you don't believe in what His death on the cross meant ? NO
Do you believe in the Lord if you don't believe in the resurrection ? NO
Do you believe in the Lord if you don't follow His commands ? NO
Do you believe in the Lord if you hate other people ? No
Do you believe in the Lord if you refuse to do for other people in need ? NO
Not attacking anyone, just posting the Messiah's words;
Yahchanan 8:31, "...
If you continue in My doctrine, then you are truly My disciples."
John (Yahchanan) 14:6, "Yahshua proclaimed to him: I am the way, the truth, and the life; no man comes to the Father,
except through Me."
Yahchanan (John) 14:15, "
If you love Me, keep My commandments."
Luke 6:46, "And why call Me;
Ruler! Ruler! and do not the things which I say?"
Yahchanan (John) 4:25-26, "The woman said to Him; I know that the Messiah comes, and when He comes,
He will tell us all things. Yahshua said to her: I am He speaking to you."
Yahchanan (John) 14:23, "Yahshua answered, and said to him:
If a man loves Me, he will keep My teachings and My Father will love him, and We will come to him and make Our home with him."
Mattithyah 16:27, “For the
Son of Man will come in the glory of His Father with His Malakim; and then
He will reward every man according to his works.”
Mattithyah 28:20, “Teaching them to
observe all things that I have commanded you. And lo, I am with you always,
to the end of the age."
Mattithyah 24:35, “Heaven and earth may pass away, but
My teachings will not pass away.
Yahchanan (John) 5:28-30, “
Do not be astonished at this-for the hour is coming in which all who are in the graves will hear His voice, and will come forth. Those who have practiced righteousness will be resurrected in order to live; and those who have practiced wickedness will be resurrected in order to be damned."
Deuteronomy 18:18-19, "I will raise up for them a Prophet like you from among their brothers, and I will put My words in His mouth, and He will tell them everything I command Him. Whoever will not listen to My words, which He speaks in My Name,
I will judge him for it"
"listen" is word #8085 שָׁמַע shama` {shaw-mah'}
Brown-Driver-Briggs (Old Testament Hebrew-English Lexicon)
A primitive root; to hear intelligently (often with implication of attention, obedience, etc.; causatively to tell, etc.)
Hebrew Word Study (Transliteration-Pronunciation Etymology & Grammar) - 1) to hear, listen to, obey