Quote:
God's most likely main motivation to create humans was...

God created man to worship Him, but He gave man free will.

Quote:
What would God mainly do to be believed in?

God has revealed Himself through nature, through His word (the bible), and throught His Son, Jesus Christ.

Quote:
What would God mainly do to make humans do good deeds?

God does not make humans do anything. He gave us free will. If He wanted to make us worship Him and not sin, then He would have created robots and not have given us a choice.

Quote:
What would God mainly to to learn from humans?

God does not need to learn anything. He is God and He knows everything.

Quote:
How would God react on people not believing in him (Atheists)?

God has said in His word that if we reject His Son, Jesus Christ as our Saviour, then He will reject us.