Do you think Christianity has a lot of things that don't make sense.?

Question

Like the one that's been asked on here before, about; How did the population grow from two people if incest is considered a huge no no?
Woman are treated second class, in the bible, surely Christians don't believe that now, yet God says " I am God I never change"
People where supposed to live to rediculously old ages.
There is talk of giants.
To fit every living thing into one boat would be impossible, no matter how you justify it.
I'm no their are lots more, but the answer that always seems to be given, is that you must have faith, and that (some people say) it is wrong to question. To me that's just a cop out because people don't know how to explain it, and it's wearing a bit thin.
I actually do believe in a God, but I don't believe that the bible is supposed to be taken literally. There are really outdated concepts
that need to be updated.

Answer 1

I know that Christianity has a lot of things that don't make sense.

Answer 2

Incest was not forbidden until the Law of Moses was given. If you noticed, Abraham married his half-sister.

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I get the impression that some things in the Bible don't make sense to some people because you do not keep them in their historical & cultural context. But that's just my thoughts.

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Abraham replied, "I said to myself, 'There is surely no fear of God in this place, and they will kill me because of my wife.' Besides, she really is my sister, the daughter of my father though not of my mother; and she became my wife.
~Genesis 20:11,12 (NIV)