What to believe in?

As a child we are taught what our parents teach us and they usually learn how their parents teach them and so on. How do we actually know what we are taught is right, religiously? Because it is imbedded in our head since birth that God had a son named Jesus and he is our Christ and all the stories of the Bible, we believe it to be so with no questions asked. Every christian religion has their own interpretation of the Bible and alot contradict each other. Other religions have different beliefs all together with no Jesus, so where did those beliefs come from? What makes the christian beliefs true and the buddists wrong for example? Just because the Buddists believe in Buddha they are going to spend all eternity in hell? Depending on where your from, you have certain religious beliefs, so who is right? I was raised baptist and went to church and worshipped God and Jesus but now I question the truth. I have been reading and reading and even feel guilty for questioning the truth. All in all I realize more and more that maybe there is no truth. Maybe when we die we roam the Earth for all eternity. There is scientific proof that the Earth is millions of years old, where is the history of it? In museums, not in the Bible. I'm not saying the Bible is false, I'm just saying maybe there is more and we are just to brainwashed to even question and search the truth. I was told that I should NOT question God I should just have faith. How can I not question it when there is so much contraindications? One scientist took the main components of the Earth and allowed them to sit together for over 25 years and guess what was created....One single cell with a DNA strand...hmmmm. I wonder what would happen after a hundred years or even a thousand. The entire universe is full of gases like the ones on earth, maybe there is life on other planets.
The christian religion is tainted by paganistic ways, yet pagans are evil and we all have an excuse as to why we continue these rituals. Christmas and Easter for example are paganistic holidays. Astrology, ever read your horoscope in the paper and say "Wow, that is so true?" A form of witchcraft. Yet if a christian is asked about a wiccan, the christian looks down upon them, why they are no better.
We all have our own beliefs, so who is right?
Religion, I think, is like manners (please, thank you, sorry, excuse me). Next time you need to use your manners, don't or think to yourself, "why did I just say that". Because it is programmed that it is the right thing to do, just like a specific religion is programmed in our heads for years that this is the way it is and the right way to be. Is it?