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

[He lives]

I understand the human body better than a 747.  So much for complicated.

How does the body maintain the PH of the blood? What is the length of the blood vessels if they were connected together? WhaT causes the cells to stop splitting? And as for DNA:

For the past decade, scientists have been working on the assumption that 20,000 genes, less than 2 percent of the total genome, underpin human biology. But a massive international project called ENCODE has just revealed that plenty of the remaining 98 percent, once tossed aside as "junk DNA", is in fact incredibly important.

In fact, the project—known more formally as the Encyclopedia of DNA Elements—reveals that 80 percent of that "junk DNA" is biochemically active. Add to that the fact that large stretches of DNA that appeared to serve no purpose actually contain over 400,000 regulators that help activate or silence genes, and the scientific community is surprised to say the least.

From: https://gizmodo.com/5940914/the-human-ge...ts-thought

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[quote=KhemikalObviously not -just- like a boeing 747.  People designed those...we probably didn't design life, lol.  Further, 747s aren't born.   They don't have heritable attributes to pass on, along with mutations, to the offspring they never have.  So...regardless of what it is you believe..or what you're trying to express with this tired ass comment...what's "obvious"..as in actually obvious and not obviously an article of your faith..is that our bodies didn't come about by any process even remotely like the one that gave us a 747.  

Because of this...the fact that a 747 is designed has absolutely nothing to say about our bodies or how we came to possess them as they are. 

The smallest one cell animal or plant is perhaps 1,000 times as complex as a 747. It would be much easier to design a 747.

Nature had billions of years to design a 747, but it didn't.

It couldn't.......so.......that's hardly surprising. 

 Our bodies are much more complicated than a 747. There is a big problem with nature did it.

Sure...horrendously complicated.  Perhaps needlessly complicated.  Piles and piles and piles of accumulated systems and divergence.  There are tons of big problems -because- "nature did it".  I mean...that or your tinkergod is a massive fuckup and perpetual underachiever that couldn't engineer so much as a 747 (never quite got around to that one..did he...that was our baby).....despite having eternity from eternity and all the power in the universe with which to do so.  The pinnacle of his creation being substantially less well engineered than a 747 in the first place - but we're working on it..so we might cover for his ass again.    

Your call.

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Adam and Eve had perfect bodies to begin with. When they became mortal their bodies were changed and became imperfect. They still lived almost 1,000 years. Later our bodies were changed to a 120 year lifespan. Has science been able to add another 120 years to our lifespan? We are actually getting worse, not better. Your call.