The anthropic principle simply states that there are several universal constants and that these constants take on their values according to the requirement that carbon based life can evolve at some point during the universe's history. The universe must be old enough that this has already occurred.
Weak anthropic principle (WAP)
The weak anthropic principle states that in a universe that is large or infinite in space and/or in time, the conditions necessary for the development of intelligent life will be met only in certain regions that are limited in space and time. The intelligent beings in these regions should therefore not be surprised if they observe that their locality in the universe satisfies the conditions that are necessary for their existence." (Steven Hawking. A Brief History of Time)
Strong anthropic principle (SAP)
This form states that a universe "must have those properties which allow life to develop within it at some stage of its history." (John Barrow and Frank Tipler, The Anthropic Cosmological Principle)
Participatory anthropic principle (PAP)
This form states that a universe cannot come into being without observers (Barrow and Tipler). The implication is that these observers must be sentient.
Final anthropic principle (FAP)
This form states that intelligences must evolve within a universe and that once evolved will not die out.
The FAP has also been dubbed "the Completely Ridiculous Anthropic Principle (CRAP)" by author and skeptic Martin Gardner.
Syllogism
p1. There is some kind of special significance to human life and or the human frame of reference.
p2. From the human frame of reference we seem to observe a number of 'constants' that are necessary for human life to be sustaineda. Goldilocks zoneb. Oxygen levelc. Strength of gravity fieldsd. Etc
p3. It is far too improbable for all the necessary 'constants' to occur by chance
c1. Therefore the universe was specifically made this way
c2. Therefore God