Are you aware of the supernatural probability that would have to take place for Evolution to take place? 
You have to believe some crazy stuff happened to believe in Evolution, in my opinion. The universe has so many things that are just right that are so freakishly improbable to ever occur. That definitely qualifies as belief.
1) This is either referring to the universal constants or for specific events.
Universal Constants is the better argument but there is no way to even estimate the probability of one of the constants being any particular value. Thus we cannot make valid claims about it being or not being improbable.
Specific Events is the weaker argument. It claims that the total probability of the specific humans of the specific human species of the specific planet earth is low without then counting the number of simultaneous independent events occurred (different species, different planets, different suns, and different galaxies). It is akin to the counting error of saying "The chance of winning the lottery is so low, therefore everyone that won the lottery did so only because some yet unexplained supernatural cause". If there is a 1% chance of a specific outcome and 1,000 events, we would expect that outcome to show up ~10 times.
2)Anthropomorphic bias
For all non 0 probabilities, if they happened, the probability that they happened is 100%.
First - why do humans have a common ancestor? That wouldn't make sense according to microevolution. As one evolved somewhere on this planet, on the other side there should have been humans for a long time, or just starting. Why are there such giant differences between us and our "ancestor" apes? DNA example: bananas are more closely related to humans than apes! Yet no one has said we came from bananas! 
I was referring to Earth's position and supreme ability to sustain life unlike any of the other celestial bodies we have observed.
Ah since you are referring to Earth's position:
1) What it the probability of a randomly generated planet being similar enough to earth?
2) How many planets exist in the entire universe?
Since the 2nd number is many orders of magnitudes larger than the 1st ...
Someone already corrected you about bananas being 50% to ape's 99%. However I will go further and point out that biologists do claim that bananas, apes, and humans all evolved from the common ancestor that mutated the ribosomal proteins that we all share with negligible variation.
Does humanity as a whole share a common ancestor? Well I'll ask it this way, you have a population of 100 vulcans. How many generations go by before their offspring are all distantly related to one another?
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Sorry that was not a serious answer.
First - why do humans have a common ancestor? That wouldn't make sense according to microevolution. As one evolved somewhere on this planet, on the other side there should have been humans for a long time, or just starting.
1) Why would you expect humans to evolve multiple times? Eyes have evolved multiple times but they are much higher probability (for multiple reasons dealing with the much fewer base pairs involved).
2) There was no "1st" human under evolution. Speciation happens at the population level rather than at the individuals level. "Common ancestor" is usually referring to those nodes when speciation happens at the population level. It is not referring to a literal individual (although go back some more generations from a node and you will have several literal common ancestors as my joke answer pointed out)