Respectfully, simply said, God did not die. How could this be? The bible teaches us that God does not have a beginning and that he always will be ( no end)
We can not really understand this but it is the truth. Please read Psalm 93:2; Isaiah 40:28. Of course these are not the only scriptures that verify that God is from eternity to eternity. Now on the other hand Jesus God's son died for us.
Here is the problem, Many religions that claim to believe in the bible teach that Jesus the Christ is God, but that is just not true. Jesus is called the firstborn of all creation please read Colossians 1:15 Clearly, then, as the very first of God’s creations, Jesus could not be the Creator, In Luke 1:35 we can see that Jesus was implanted into Mary by God.
Matthew 3:16, 17 is another good scripture to see that God called Jesus his son.
Many religious leaders teach what some call the Trinity The bible does nowhere teach this doctrine.
Jesus also showed that he was separate from God. Jesus once said to opposers who challenged his authority: “In your own Law it is written, ‘The witness of two men is true.’ I am one that bears witness about myself, and the Father who sent me bears witness about me.” Read it in John 8:17, 18 Jesus must be separate from God How else could they be viewed as two witnesses?
Another problem is that over the centuries bible translators have taken out God's personal name and have replaced it with LORD ( they use lord for Jesus and where God's personal name occurred the use capital letters ) God's personal name is Jehovah and you may find it in your bible in Psalm 83:18 If not you can do research for yourself. Jehovah appeared in the oldest manuscripts and scrolls over 7000 times. Can you see that this might cause confusion? Jesus is not almighty God but God's son like all the other angels Jehovah God created in the beginning. We honor that Jesus died for us He is our redeemer.
Why he had to die is also very simple.
Adam and Eve did not listen to God by eating the fruit of that certain tree. The tree was a symbol of showing that Jehovah God had the right to make rules After all He created them. Satan claimed that Adam and Eve did not need God to tell them what to do and they were purposely disobedient. Their punishment was that they would die ( simply go back to dust ) Read Romans 5:12
Now read Romans 5:19 and see why Jesus died for us. God made us to live forever If Adam would not have sinned he would still be here on earth right now.
God will fulfill his purpose and the earth is our home Check out Psalm 37:10,11 and verse29 All we have to do is study God's word and do it accurately to get to know the truth and not what someone tells us that has been passed down as doctrine from tradition.
If you want to check out this wonderful website that really teaches bible truth I think you will like it very much. Please be respectful to your Mother and share this with her perhaps you can investigate this together. The website is jw.org
check it out take care and thank you for your question.