Why would God?

[Sword of Christ]

Why would god make so many mistakes if he is the all powerful creator?

What mistakes would those be? If you mean the suffering and death aspect of life that can be set up as an arena into which intelligent beings such as humans can have freedom of will. So that's not really a mistake it's something that was deliberately done.

He made humans and everything and gave us all sin? Why?

If you give something that finite and limited freewill then it will end up with flaws. But God has accounted for this through the atoning grace of the Christ so it's all fine and good. You can have your cake and eat it this way. You have to love it when a plan comes together like this.

He made all humans, so he made some gay. Why does he frown upon what he made?

Even if you want to say homosexuality is a sin everyone is a sinner anyway and we've all been accepted/forgiven by God regardless therefore homosexuality or sex before marriage or whatever you get up is fine, it's just what you do as a flawed human. I know it says homosexuality is a sin in Leviticus but you won't find many Jews or Christians who uphold everything it says in that particular book of the Torah/Bible. Call it cherry picking but this isn't the bronze age.

He knows all, so wouldn’t he know that we would torture and kill his “son”?

Jesus knew that he was going to be betrayed and killed in advance see the last supper and the Garden of Gethsemane. Not only did Jesus know what was going to happen he was as a human greatly distressed by it. Jesus was also God in some mysterious sense so course God knew that Jesus would die if Jesus did. You can see how it flows together.

He made humans so why did his son have to be born and not created?

Jesus as part of God/Trinity was never created though God to be visibly manifest in hum,an life had to be born through the womb of the virgin. If he was born that particular way but the same concept applies regardless of his Earthly/physical origins.

Why would god make the devil just to have fun taunting and tempting us?

Satan if he literally exists and isn't a metaphor for human sin would be an arch angel and apparently angels like humans have the free will, or at least they can deliberately sever themselves from God to have their own freewill. Humans can have freedom of will without being severed from God as to sever yourself from God eternally is what we would call Hell. Hell isn't a place you necessarily get sent to as a punishment. In Revelation Satan does get thrown into a lake of eternal fire along with the Anti-Christ and his followers after the Armageddon/the end of the universe but that isn't necessarily the same thing as Hell. Notice when Satan tempts Jesus in the desert he's still roaming around free.