The Ilogicallity of The Bible

The bible, in some sense, is a bit ilogical. They say things that have no sense at all. For example, in Genesis 5, Versicle 5, "And all the days that Adam lived were nine hundred and thirty years: and he died." Here you can see a clear example of how the bible says some things that have no sense whatsoever. How could someone live for 900 or more years? This is not the only example, in Genesis 6, Versicle 4, " There were giants in the earth in those days...". How could there be giants in the Earth? Do they mean something that we have yet to understand, a subliminal meaning, or something? As well, you can see that from Adan, came Seth; From Seth, came Enos; and from Enos came Cainan, and this chain goes on and on for a long time. Here, you never see with who do they bare a son. From my point of view, there are two options. Either they all married with Eve, and had sons with her, or they had sons and daughters with their own cousins and aunts or other familiars. I mean, they do not accept Gay people in this religion, but they allow this, and promote it by puting it in the bible? Also, it is amazing how so many animals were able to quickly reproduce and repopulate the Earth, even though they just came out of a flood. This are examples of things the bible say, that have no sense.