The Trinity is a church word to describe God. He is one God, but in three distinct part. They work together in perfect harmony. Together they are one, but they each have their own distinct roles in every aspect of the universe, time, and everything else. There is no true comparison because the creation cannot be compared to the creator.
To simplify the trinity God is given different distinctive names: God the father, God the son aka Jesus, and God the Holy Spirit. It makes it easier to wrap your mind around it, but if you go back to the beginning God didn't have a name. He had descriptions. His first name was Yahweh to mean "I am". We gave God names to make it easier for out brains to connect with Him.
The trinity is not three separate people. It is only one God with three distinct parts. No mythological God can be put in God's place. You can't just declare that your god is God. You have to meet God and understand the difference between Him and unreal gods. You have to have a reality check to see that you are not your own god. God can't be changed, molded, manipulated, or created. He is who He is and nothing comes close to comparing to Him.
People will never perfectly be able to describe God. You are His creation talking to His other creations about Him. Your soul knows Him. You soul knows the truth. You have to allow your soul to understand in faith. Trust that God will reveal Himself. He can speak for Himself, but He chooses to work through people.
God reveals Himself in His Word and through supernatural means. His character, ways, wise counsel, and the Holy Spirit are ways that He gets through to people. God is good. He cannot sin. God is holy and holy cannot be evil. He created Satan and all other angels. He gave them free will too.
Satan chose to rebel. Satan then was cast out of Heaven to roam the world. He introduced evil and wickedness to the world. People do not have to listen and follow, but every single person chooses to at one time or another. That is not God's fault. You cannot blame God for your shortcomings and consequences. He is the source of all truth and who He is should not be altered to suite anyone.
Isaiah 45:1-7, 1 Timothy 2:1-7, Titus 1:1-3, & James 1:12-15, 2:19-20