Why did god made death?

[Nobody]

It sounds like you're seeking reasonable answers in an irrational faith.
This might help you to see how christians think. It's especially impacting to realize that there are christians who have given their lives because they thought so much of what they believed in that they believed the sacrifice was worth it.
It's a shame. But the gene pool is better for it.

Why did God create death?
"...God may also be allowing Satan to operate in order to help us develop holy righteous character more quickly, since Christians have to learn to resist against Satan's influence. Here the analogy would be with weight-training and the concept of resistance, only there's a spiritual principle being applied here: We develop the habits of obeying by our own free choice more solidly and permanently if we have to resist more in order to develop them. "

Like if god loves us,and he wants us to be happy why did he create death then(and all other painful experiences for that matter) It's like life is shit anyway and what do you get at the end death is this like an bonus or something?

And why didn't he just put us in heaven in the first place why do we need to be on earth first then go to heaven?

Childless questions but i'm a child