I'm really not too sure how you can reject the age of the Earth being in the low billions of years, every indication we have for the date points to it - dating by radioactive decay, geological examination (hundreds of millions of years of sedimentary rock build-ups, mountain ranges which conform to the idea of plate tectonics and then erosion), the fossil record, the observable history of asteroid impacts on the Earth and other observable bodies in the solar system, examination of other stars and galaxies (which allow us to examine all stages of their lifecycles).
All the means and methods of dating used to date the age of the earth are still relying on a predicited age, and observed amounts of time (i.e.: half life, decay constant, etc) which we can obtain results for here and now, are then projected onto the presupposed timescale of the earths age. To apply legitimate results obtained by scientific research, carried out in our lifetime, to a presupposed number(thought up by men just a few generations ago), and then claim it as fact even though it's unobservable and untestable, is bad science... in fact it isn't science when it crosses outside of our physical world.
Simply the fact that we can detect EM radiation from things billions of light years away indicates the universe is that age (admittedly not the Earth, but my understanding of Creation is that it is meant to be a fairly all encompassing event).
Because something is billions of light years away, doesn't add value to the evolution theory. "In the beginning, God created the heavens and the earth" (Genesis 1:1), billions of light years doesn't discredit this opening verse of the Bible. For something so complex as the earth and everything in it to evolve (from nothing might I add), the odds would be next to nil. For a universe, billions if not trillions or more light years across to evolve from absolutely nothing has even more drastically minute odds. Evolving planets or stars have never been observed, and even if they claim that a small change in formation constitutes evolution, well the only way they can support it, is if they project that small observed change onto that preconceived timeline.
My Grandmother was a Roman Catholic and I asked her once about how she viewed Genesis (annoying teenager sniping at his elders religion basically), she said (from memory, this was over ten years ago) she viewed the early books of the bible as chronicling the journey of the Jewish people towards an understanding of God - that much of the Old Testament shouldn't be taken literally, but it was still a vital guide towards knowledge of God. I find this explanation quite a lot easier to buy than the idea that God buried the fossils in order to test our faith or whatever.
The Roman Catholic Church and their views, do not necessarily line up with Christianity as taught in the Bible. I'm not saying that there aren't Christians in the Roman Catholic Church, but the Reformation came about due to the false teachings of the Roman Catholic Church.
Saying that the Old Testament was mostly symoblic rather than literal can put one on shakey ground, wherein it encourages a low-view of the Bible, even though it is "God-breathed" (2 Timothy 3:16).
Also, "the idea that God buried the fossils", is not a view held by anyone I've talked to or even heard about. Many Young Earth Creationists do however believe that fossils were buried during a world-wide flood, as per the account in the Bible (Genesis 6-8), which is very plausible.
Now while any Christian obviously holds that the bible comes from God, the simple fact that we have different sects of Christianity with differing scriptures surely must indicate that men have had input into the bible.
Tis true, there are many different sects, and I'm not sure if by that you mean "sects" as in "denominational divisions", or as in "cults". Either way, different denominations within the Christian Church do have slightly different interperetations and translations, and may not agree with everything each other believes, _but_ the Gospel remains, the message always stays the same. As for cults and the like, if they preach anything contrary to what the Bible says, then it is not Christianity and therefore false.John 3:16-21"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life. For God did not send his Son into the world to condemn the world, but to save the world through him. Whoever believes in him is not condemned, but whoever does not believe stands condemned already because he has not believed in the name of God's one and only Son. This is the verdict: Light has come into the world, but men loved darkness instead of light because their deeds were evil. Everyone who does evil hates the light, and will not come into the light for fear that his deeds will be exposed. But whoever lives by the truth comes into the light, so that it may be seen plainly that what he has done has been done through God." Matthew 19:17"Why do you ask me about what is good?" Jesus replied. "There is only One who is good. If you want to enter life, obey the commandments."