When it comes to the origin of life there are only two possibilities: creation or spontaneous generation. There is no third way. Spontaneous generation was disproved one hundred years ago, but that leads us to only one other conclusion, that of supernatural creation.
(here is an article showing a survey done in 2009 that 51% of scientists believe in a higher power:
Scientists and Belief)
update:
(disclaimer: I don't believe we can prove most things. Most facts cannot be proven, most science cannot be proven etc. However I believe that some things can be proven. The universe had a maker. We all accept this, or the alternative is that the universe made itself, spontaneous generation was disproven 100 years ago, thus there is only one option. The universe was created. Now the thing that created the universe, must according to cause and affect have intelligence, and be rational. It must also contain any positive character traits, self sacrificial love etc. Things that are not explained by herd instinct. Herd instinct accounts for some morality, but not self sacrificial love. A wolf may gather food for the rest of the pack, but not at it's own demise, it will most likely eat first, then get it. Humans on the other hand have been known to sacrifice for others. This type of love has no natural origins. Thus the one who created the universe must have that type of love, in order to create it in it's creation. The only thing that resembles a loving creator that is intelligent and rational. Is the Christian God. This to me is proof.
Updated on some misconceptions:
Right now I wish to dispelled the most popular viewpoint among athiests, a multiverse created the universe:
How could a collection of rocks floating in a multiverse gain the ability to create an entire universe from absolutely nothing? I await your reply. Secondly, say a miracle happened and a multiverse allowed asteroids floating in a multiverse ability to wave a magic wand and create an entirely separate universe from nothing (ex nihilo). Why would a multiverse create another completely separate universe that it had no working relationship with? Just to be nice? So we not only have miraculous meteors, but we have benevolent meteors. Not only that but these meteors are timeless and have no beginning, even though they have mass, and are susceptible to time via general relitivity. This is sounding more and more like mythology. It takes more faith to believe that. Than It Does to believe, God who n is self existent and self defining (per the definition of God), creating the universe in order to ultimately save, love, and glorify his creation, and to spend eternity, exploring how he in fact created, and to spend time with His creation, in loving fellowship.