Here is the second part of my rephrase. I'm finding it difficult to summarize the last paragraph.

1) In the second passage (excerpt) Robinson instructs Friday in the Christian religion. Friday, on the other hand, comments on the difference between Christianity and his own religion.
2) Friday seems to be favourably disposed towards the Christian religion and he seems to consider Robinson’s teaching with high respect.
3) Robinson teaches him that God is the great Maker who can do everything for us but can also take everything from us. In particular, Friday receives with pleasure the notion of Jesus Christ being sent to redeem humans and he is glad to learn that Christian prayers are so powerful that they reach (be heard?) into heaven.
4) Friday tells Robinson that their God can’t be heard by humans because he lives on the great mountains and only the old priests go up to him (?) to say their prayers. When they come back they report them what their God, Benamuchi, tells them.

1. Fine

2. Friday seems to be favourably disposed towards the Christian religion (COMMA) and he seems to consider Robinson’s teaching with high respect.

3. Robinson teaches him that God is the great Maker (COMMA) who can do everything for us but can also take everything from us. In particular, Friday receives with pleasure the notion of Jesus Christ being sent to redeem humans (COMMA) and he is glad to learn that Christian prayers are so powerful that they reach (CAN be heard?) into heaven. (EITHER WAY)

4. Friday tells Robinson that their God can’t be heard by humans (COMMA) because he lives on the great mountains and only the old priests go up to him (IS FRIDAY'S GOD PERCEIVED AS MASCULINE?) to say their prayers. When they come back (COMMA) they report them what their God, Benamuchi, tells them.

This may help:
http://grammar.ccc.commnet.edu/grammar/commas.htm

To summarize the last paragraph, it discusses Robinson's instruction to Friday about the Christian religion. Friday shows a positive disposition towards Christianity and respects Robinson's teachings. Robinson teaches Friday about God being the creator who has power over everything, including taking things away. Friday particularly appreciates the idea of Jesus Christ being sent to redeem humans and he is glad to learn that Christian prayers are powerful and reach into heaven. On the other hand, Friday tells Robinson that in his own religion, their God resides on the great mountains and only the old priests can communicate with him by going up the mountains to say their prayers and then reporting back to the people what their God, Benamuchi, tells them.