So figures like Mother Teresa, St Nicholas, St Patrick, St Valentine, etc are in Hell?
Hello there. I hope all is well and I truly want to help you answer this as best as I can.
1st off this world is divided into Jews and Non-Jews and in short, to serve different roles just like anything else (i.e. parents and children, kings and servants, beasts and fish, men and women, rain and sunshine). Why? Simple. God created it this way for us to work together as brothers and sisters and learn who to appreciate all aspects of life that God made. For King Solomon could find wisdom even in the attitude of an ant. The reason I brought this point up is to understand that the NT can "easily" be misunderstood when even one single verse is taken out of place. Hence why there are 40,000+ denominations of Christianity and a massive separation between Catholics and Christians which people call "doctrines". This should summarize why separations are made sadly.
2nd: If you truly desire to understand the bible better on a personal level, you pray with all your heart that God will give you the insight you need to understand each verse and if you are seeking truth, He will provide. What is better than this? Learning from a teacher/leader. But who should you go to? Let me ask you a simple question: If you wanted to learn French, would you go to the Native German speaker who studied French for 2-3 years and decided to teach later in life or from a born Frenchman who lives to teach French? How much more so should one go to someone who knows the original language of the text, lives the original language and commandments and doesn't need an english, latin, roman, kjv, niv..... translation.
3rd: Straight to the point. Anyone who summarizes "judgment" into simple words or by using one or two verses out of context, I would run from. People are prone to try simplify things for their own benefit just like apps on our phones, and just look how "wonderful" we are as people today. Have you ever seen the processes and thought process it takes to complete a divorce? And one would think that God simply just casts a soul to heaven or hell on "I believe this doctrine or that doctrine?". Heaven forbid. God will judge each individual from every thought they had, every conversation that had, the circumstances they grew up with, the accessibility to God's word, what they did with there time, etc. It is true that is the "love of God" that saves, but do you go to your wife or husband and say, "Hunnie, I love you". Then your partner asks, "Wow, I love you too. Can you do the laundry for me while I take the kids to school? Can you warm up the car for me while I get dressed? Can you wait for me another hour while I speak with my parents? etc". and then your response is, "Sorry hunnie I love you but I don't have to do anything in this relationship because God loves me! Or Hunnie we just have to 'love' but not do anything". See how far that relationship goes. You think God created us just to "think" that we love Him? Or by His love and grace IN RETURN we show Him how much we love Him with what we have and what we are willing to do for Him? Just look at the life of Paul and the words he uses and that alone should summarize what it takes to be in the Kingdom of Heaven (regardless of what "doctrine" you think you follow). Therefore, yes your faith in God and Jesus is important, but God so much more would rather see you get along with your brothers and sisters, love people who hate, give money or food to those who need WITHOUT JUDGING, spend more time with the elderly and widows, cover your bodies and not look at inappropriate things, speak only positive words and cast away the negative thoughts AND THIS will show God how much you accepted His love and grace!.... "By your fruits you shall know"... BUT even then, "The Beginning of Wisdom is fear of the Lord (not Corona Virus, not your boss, not anything else)" and by the grace of God we have proven ourselves loyal and that we desire to have a relationship with God. Billy Graham once said, "I'll tell you how deep your faith is by telling me what you do with your spare time"
4th: By now you may be able to tell that your question isn't so simple. If you wife wants a bag of milk and you buy orange juice, thinking "she will love OJ instead", how will she respond? God has rules for Jews and Non-Jews. Non-Jews. Example, both cannot worship idols (i.e. statues, other powers other than God). The Catholic church misunderstood a Jewish teaching, where Jews do NOT pray to the Patriarch's or Rabbi's (i.e like Rachel's Tomb or Chevron), but they pray in their "MERIT" because their spiritual reception was and is much greater than ours. Catholics however started making their own "saints" and prayed "TOO" them instead of in their merit. Hence why Jesus always since "IN MY NAME", not "TO MY NAME". So yes, this was wrong on the Catholics point. But could I name a flaw with EVERY sector, YES. Why? Because we are all HUMAN. That is why we need mercy, why we need forgiveness and therefore the requirements to receive such a gift is too... FORGIVE OTHERS!!!
Tell me, what will God judge you more on, forgiving others and making hard choices but mending relationships, or simply throwing in your mind a doctrine (only)? But people will tell you its simple, its this and that. No the mechanics of life are complex and wisdom is hidden from the fool, "Seek first the Kingdom of God and HIS RIGHTEOUSNESS and everything else will be given to you"!
I hope this answers your question! I am more than glad to help you with anything else.