keep in mind most of the stories in the bible among other religions find there origins in past religions, often polytheistic religion that have died off.
I do believe in god, or at least hope he is there. I don't have rituals, I don't believe I have to dedicate a whole day or month to show my believe. I believe that if there is a god he wouldn't interfere with our lives no matter how bad they got, because we deserve what we make. If anything he would want us to live, lives a father could be proud of. Above all there is no black and white in life, so I don't think he would lay down "commandments" to live by.
As far a noah's arc, I believe the truth behind that can be found in science. I dont think the story is true at all, maybe origionating off a farmer with a boat that managed to survive or claimed he survived. Based on science and the area's and origions of the people that came up with the myth it is generally accepted in scientific communities that the story came from the black sea's creation. The black sea used to be land, but at a low elevation, then the sea level rose and the area was flooded rapidly. Think of a small country sized tsunami that was just one big wave, rather then several large one's resulting in a rapid increase in sea level. This one just came in all at once.
Also another big flaw is science is that how could it rain that much on the earth? We know that the polar ice was bigger back then, then it is now. Where did all the water come from or where did it go?
As far as aliens, I believe in them. The world is to big for us to not have them, and we have substantial amount of evidence that they have at least visited earth. I watched a show called UFO hunters, and that really sparked my interest to look up more info on them. Unfortunately during the show they only came up with one very concrete piece of evidence, aside from the star child skull which had already been found. They found a super-conductor from an incident 15 years ago that we still can't make. I know they analyzed it, but they only pulled data based on it's make up and lack of electromagnetic field, but the surprise is that we cant duplicate it by a large technological margin. Some other evidence came up like people with objects in them recalling abductions, however when the implants were tested by the team it gave off AM radio signals, along with being assimilated with the persons body (ie; the body didn't reject it as a foreign object). When the object was removed it stopped transmiting it's signal, however based on tests on the object after wards no technology hinting towards alien life was found.
but on the religion aspect, I take anything written about how the world works that is more then 100 years old with a very large grain of salt (and sometimes tequila)