Best evidence against God
Evolution by natural selection is caused by random genetic mutation, not by a rational divine guiding hand.
This is not evidence against God. I know many Christian theists who are also big fans of Darwinism. They believe that God is VERY smart, as in orders of magnitude more intelligent that mere mortals, and that the entire evolution of all life is just part of "
The Plan" and is "business as usual" for the Christian God.
Best evidence for god
The observed fine tuning of the physical constants of the cosmos are mathmatically and probabilistically highly unlikely
You have got to be fucking kidding me. Yes, I have heard Christians chant this but this is a necessary part of the Christian faith, and is just a religious "perspective" and is not, in any way, a rational analysis. It's not even remotely accurate.
[apologies to Christians -- warning: don't read this part if you're really not interested in atheist perspectives]
This is
not the best evidence
for God; it is the most convincing evidence
against the existence of the Christian God. The observable universe is a random dust cloud. The nature of the universe is totally hostile to human life, with the exception of one infinitesimally small speck to which humanity seems to be banished to struggle for limited resources that has many starving every day. There is no hope for escape to any other suitable location. There is nothing within reach that is not utterly hostile to human life, yet the universe is vast beyond comprehension. Humans gaze with telescopes out into space in all directions and the only places observed that do not represent instant death for humans are beyond exceedingly rare, are not reachable for any population of humans given all available resources on earth, and nonetheless represent nothing but torture chambers in which a generation would suffer greatly until meeting its demise.
There is nothing "finely tuned" about the observable universe. It is completely random and hostile. It leads to the question "Why is it like this?" The answer is "Maybe there is no 'why' because it wasn't intelligently created." Anyone who has listened to a child look up into the nighttime sky and say "Wouldn't it be neat/great if ...?" might ask himself "Yeah, it certainly would ... so why isn't it?" If children can imagine improvements, how could any "creator" have thought that a totally random and hostile vastness was somehow optimal? I marvel at those Christians who become confused when I tell them that it would be a simple matter, even for children, to design a better universe than the one we have.
gfm7175 has what I consider to be the best Christian take that I have heard thus far (for the observable universe being what it is), which is that this life is not even a blip that registers when compared to eternity, and that we wouldn't understand happiness if we never experienced pain, and that we wouldn't understand good if we never experienced evil. Maybe the hostility of the universe can be looked at as effectively ensuring that Christians will appreciate heaven when they get there. As such, there is no reason to pretend that the universe is somehow Disneyland for humanity.