My reason for saying most Christians do not understand Jesus is because of their conduct and their focus. Their conduct speaks for itself. As for their focus, Jesus was focused on love, not rules, or gain or loss of that which belongs to the physical realm, thus he broke the sabbath, broke rules on touching women, broke the commandment on vengeance (eye for an eye), broke the commandment on punishing adulterous women [with death], etc.
Your questions are textbook out of the watchtower: you want me to expound on 144,000, for example. I'm not interested in wasting time providing an answer that you cannot, and will not, even respect, because it's supposedly from Satan' and, as you are taught, only the watchtower has the right answers [when it comes to the bible], so it's almost a done deal you, an ardent witness, will not respect my answers.
Moreover, I'm not interested in teaching people the bible. The bible teaches itself, what I have pointed out is Jesus' way to understanding it: come to him with innocence (like a little child, with no pretense), obey the command to love, to live peacefully, inwardly, not just playing the part of peace and love. There's no point for me to answer your questions, if you have ears but do not hear: you hear what is within yourself, not what is said or written.
My recommendation is you, and others, study the bible for yourself, listen to Jesus on his terms, not the watchtower's or anyone else's. So, it's up to you and others to either listen to Jesus or listen to the failed middlemen (Charles Taze Russell and others) and their cynical counterparts (Bill Maher and other angry anti-religion figures).