What is the purpose of humanity? Did God give us a purpose or do we just die and and that's the end.

This is just another variation on the tedious 'What is the meaning of life?', which has been asked ad nauseum on countless Q&A sites. 

The only meaning in life is what we choose to give it, there is no overriding singular purpose aside from each perpetuating their kind, and it is merely a wishful empty boast to proclaim human life is more significant to the vast universe than any other life. 

Humanity ought to conceive a unified purpose for itself, it is we alone who could, but our flawed and adversarial nature has always been in the way. The various gods have rendered no aid in this. 

As for death, believe whatever makes sense to you, but it won't change the fact, whatever it turns out to be. 

You make your own purpose, not magic men.

"or do we just die and and that's the end."

No, that is not the end. Your constituent atoms are recycled and used for new forms of matter. A much grander purpose than lies told by men seeking power over others.

Well you could look at it this way we are have a brain, a heart, and courage all things the scarecrow, Tin man and Lion didn't have, they were given a degree, a clock and a medal. Maybe we're meant to work it out, let's hope we are not in the land of Oz :)

God is good and he wanted to share his good and life with others so he created us.

Well, you got to try out life first to get some answers.

What is the purpose of humanity?

Humanity simply promotes human kind. The continuance of the species and the betterment of mankind by promoting a Healthy environment, unifying nations (people) to work together to ensure the continuance of our species if possible. Understand the need for and promoting peace.

Did God give us a purpose or do we just die and and that's the end?

If anything Man gave purpose to his concept of God. The purpose is no longer relevant other then it's place in history. Mankind, as a species, lives on by passing on genetic code and our contributions in civilization recording our presence. Whether this is building a bridge, or taking a bullet for our soldier/brother next to us.

All life simply dies in the end. Immortality makes for a cramped world and quilcky depleting resources.

It's up to you to decide your own destination, yes God gave you life but it's your decision what you do with it.

This question deserves about a 5 page response, but I don't have the time.

But here's two quotes from an article, and a link to that article, that gives a decent answer to your question:

Why did God make the earth and us along with it? He doesn't really need us, so why did he create anything?

Great question, and you're not the first to ask it. King David asked essentially the same thing:

"When I consider your heavens, the work of your fingers … what is man that you are mindful of him, the son of man that you care for him?" (Psalm 8:3-4).

http://www.christianitytoday.com/iyf/advice/faithdoubt/why-did-god-create-man.html

God purposed that humans live happily and peacefully with one another and with the rest of creation. (Genesis 1:26; 2:15) Like a child who needs to sense the presence of his parents to feel happy and secure, we need a good relationship with our heavenly Father to find real meaning and purpose in life. (Hebrews 12:9) God makes such a relationship with him possible by allowing us to draw close to him and by hearing our prayers. (James 4:8; 1 John 5:14, 15) If we ‘walk with God’ in faith and become his friends, we can bring joy and praise to our heavenly Father. (Genesis 6:9; Proverbs 23:15, 16; James 2:23) That is the highest purpose anyone can pursue. The psalmist wrote: “Every breathing thing—let it praise Jah.” (Psalm 150:6)

In a Summary:

Well we all live are life. Its a test to see if we are faithful enough to live right next to his side in heaven one day.

Learn all that is learnable and,

take it back to the source.

god is a particle not a person.

You are the god you seek.

To live happy lives and to worship God who is the source of our life. Pslams 36:9