But the main difference is:
Calvinism:
Everything is arranged by God. Whoever God saves will be reborn by the Holy Spirit.
Therefore, reborn people can believe in Jesus and gain eternal life.
Martin Luther thought:
God has arranged ways to save mankind. That is, the word of Jesus became flesh, not human beings to wash their sins.
As long as people choose to believe in Jesus, they can be purified through Jesus. So as to gain eternal life.
The key to Calvinism lies in God's predestination. Only the rebirth given by the Holy Spirit can make faith possible.
The key of Martin Luther's thought lies in: justification by faith. Faith is chosen by people's free will.
There is an important reason why Christianity can spread widely:
The conditions for salvation are particularly simple. So as to satisfy human opportunism.
All Lutherans have to do is believe in Jesus.
What Calvinists want to do is that human beings have completely fallen and there is nothing they can do.
Such a theory is simply too attractive. But there is a major problem that cannot be ignored:
There are many contradictions between the "Christian doctrine" of these two schools and the Bible text.
This contradiction, even if taken out of context, is difficult to solve.
Should we believe in Christianity or the Bible?
This is self-evident.