Does a Angel of Glory's Rise and a Fiend Hunter combo work like I think it does?
The first part of your combo does work. When the Fiend Hunter enters the battlefield, he can exile the Angel of Glory, and when the Fiend Hunter goes to the graveyard, he will already be there when the Angel returns, which allows you to repeat that combo indefinitely.

However, Cloudshift on Fiend Hunter is another matter. When the Hunter leaves the battlefield with the Angel exiled, he will indeed trigger the return of the Angel. However, the Hunter leaving and returning to the battlefield are all part of Cloudshift's resolution, so by the time the Hunter returns and you get to choose another creature to exile, the return of the Angel is still on the stack and is not yet back from its exile. You will have to choose another creature entirely, and if you don't happen to have a second Angel on the battlefield, the combo will end with the resolution of Cloudshift.

As for the Champion of the Parish question: The creatures enter the battlefield simultaneously. Creatures that enter the battlefield at the same time see each other enter the battlefield, so a Champion's triggered ability will trigger for each other Human entering the battlefield at the same time. For example, if you have 5 humans in the graveyard, and 2 of them are Champions, then each Champion's ability will trigger four times, so each would get a total of 4 counters.