One of the most popular explanations has been to say the stories about Jesus have been embellished. From a simple teacher Jesus' disciples turned Him into the resurrected Son of God.
There Was Not Enough Time
The problem with this theory is that there is not enough time for this to happen. Paul's earliest letter, First Thessalonians, refutes that. The fact that Christ was killed is stated in First Thessalonians.
The Qin adopted the legalism in warfare (against the other states). They crushed one state after the other. This phylosophy worked for them in war so they decided to continue with its principles in peace time. The Qin Dinasty reflected Legalist principles by enacting laws. It was a way to control the population of China and there were severe penalties for breaking the laws, including fines and conscription in the army.
I dunno the answers to 1 2 and 3, but 4 is Germany, Italy, and Japan, and 5 is poison gad.