1- God is forgiving BUT He is also JUST, He is not Joe Biden who forgives people with no regard for justice. The same forgiving God says the sinner must die so makes sense that to forgive sin, there must be a death otherwise no justice has been done. I refer you to two of my articles:

2- There is something called the resurrection? Quite a big deal in Christianity and is the basis for the entire faith (1 Corinthians 15)

3- Remember Christianity is based on a Jewish culture not an American one. Esther is said to have fasted for 3 days even if she did not fast for three 24-hour days. Do we not even have a figure of speech called Synecdoche in English? Where we use a whole to refer to a part of something?

4- Jesus is literally the eternal God made mortal flesh for the sole purpose of dying for sin, think about that for a second. The quality of the person paying for sin is why it can be an eternal payment that redeems a person from eternal suffering.

5- Jesus did not kill Himself and you know that. He was sentenced to death by the Romans on the accusations of His own people. T0mmy R0b!ns0n willingly returned to the UK and submitted himself to the police despite knowing he will be imprisoned, does this mean he imprisoned himself?

6- has nothing to do with the gospel but on your Jesus point, see the above.

7- Christians have this thing called the trinity, which is something even in the Old Testament? Have you ever tried to at least understand what the doctrine is? Articles linked below

8- Again, trinity! They are the same essence (God) but different persons with different roles within that one essence. It is a complicated doctrine but that is how God has revealed Himself and we grapple with it. we don't get to choose how God is. What we don't do is not understand or try to understand it at all and then make statements like what you made.

Where exactly is the contradiction?

Articles for more of a deep dive into this:

https://ab-melchizedek.medium.com/how-the-hunter-biden-pardon-saga-brings-you-one-step-closer-to-understanding-the-gospel-48242451cacd

https://ab-melchizedek.medium.com/the-trinity-was-invented-centuries-after-christianity-a-rebuttal-from-the-old-and-new-testament-1d53d8c12df5

https://ab-melchizedek.medium.com/why-didnt-god-just-declare-us-forgiven-why-it-had-to-be-the-cross-b0bff7b6ceb7