Evolution started as "How did we get here? Let's look at all the evidence and come up with the best answer that explains it." Creation started as "This book tells us how everything started, let's find evidence to back it up." The two approaches are quite different: the former is science, the latter is religion.
And, no, magnetic decay, attacks on isochron dating, and speed of light changes to the extent you're talking about (not true) do not show a young earth. They are merely attempts at making observations fit the Bible.
Not true. Science usually starts with a hypothesis and then seeks to prove or disprove the hypothesis based on controlled observations, or at least as controlled as possible. As Sabertooth points out, without direct observation of spontaneous mutagenic speciation, you can never get past the hypothesis stage. Thus we simply have a theory of evolution and it should be designated as such.
By the way, I am a geologist who started off as believing evolutionary theory and, after my own investigation into the evidence, have emerged as a strong creationist.
That is religious, too. It is against a creationist religious viewpoint, and is against Christianty in general. Christianity is based on the fact of man's sin, and Christ's death on the cross to pay for that sin. Do away with Adam, you do away with sin entering the world. Do away with sin entering the world, you can do away with the need for Jesus Christ's death on the cross.