'focus' on Jesus i think you said/posted. good. the believers immersed in Him followed Him and did as He said. They questioned Him at times, but did what He said. those who did not want to do what Jesus said, they stopped following Him,. and He let them go without pleading with them and without trying to stop them. All those who the Father gave to Him, He protected by His Word, as it is written in Torah. not one was lost except the son of perdition, in order to fulfill prophesy - God Kept His Word Perfect.
now people grow up jumbled up. not knowing God's Word. being taught instead a lot of other things. so UNlearning what is not of God is, God's Doing (man is not capable). if someone listens to God to learn from God, God teaches Him. (there may be other conditions as well - in the Word and the Will and PLan and Purpose of God; it all depends on God through Jesus).
if someone "would not" , i.e. "will not" listen and do what He says, they don't learn any more. they're stopped. God won't make them learn or listen or obey. a key here is to not hold to tightly to what was learned in th past , as if it is God's Word, because a parent or teacher or whoever said it. it is written that someone who trusts in the flesh, God curses. so it is important to God Himself for His people to not trust in the flesh. trust in God. by grace through faith in Jesus Christ. that is good. then all the other things, not of Him, will fall away like scales falling from the eyes of the blind man Jesus healed...... it does and can take a long long time - even decades.... don't give up. God didn't hold back anything when He sent Jesus to be born of man a human , and to die crucifixion for men when they didn't even love Him...... He has mercy and patience.... trust Him, and wait for Him, for His Word; seek His face and devote to Him the whole life..... He will not, will never, disappoint.