What beliefs would we consider reasonable for a self proclaimed Christian to hold?

[He lives]

There were 7 periods of creation time mentioned in the book of Genesis which were called days. We also read:

(New Testament | 2 Peter 3:8)

8 But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.

Then it it took seven Not Earth Days™.  This is the necessary amount of time for all of creation, according to magic book.  On the fifth Not Earth Day "god" makes fish and birds (and whales and what have you).

The fourth Not Earth Day god having made the stars and sun and moon.

The third Not Earth Day god having made plants and trees.

The sixth..for reference, god goes on to create land animals and man.  

...and you think that genesis gets the order right, somehow?  Let's explore.

Sharks would disagree.  They predate trees, if they were created..then they would have to be created on or before the third day - not the fifth.  The whales would disagree.  They were land animals that went to water.  If they were created..they were created on the sixth day.......not the fifth.  The stars and the sun and the moon have a hell of a grievance in placement.  There's an amusing disparity with the plants in their own right....because flowers are younger than mammals but older than humans.......so somewhere on the 6th day (and pretty close to the end) would have to be when they were created..if they were created...not the third.

So you believe sharks were created before plants? How is that possible since animals, fish, and birds need plants to survive? What did the mammals live on if there were no plants? They could not survive on mud. All I can say is wow.

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Is a "brillion" like the number version of a crocoduck..or, in context, a manomonkey?

It is a number between a billion and a trillion