Benjamin,
well, a true Christian is someone who believes the Bible and has accepted Jesus (sounds cliched, I know

it's just true)
therefore I would most certainly
not classify a Jehovah's Witness as christian, as they believe things that are not biblical (such as that Jesus is not God).
the page that you linked to has a fundamental misunderstanding of core issues. To explain this basically needs a complete explanation of what biblical Christianity is, which is a bit long to post here. (I'll be more than happy to explain if you want though)
law contradictions:
wow, 3 different problems here from first glance
1. verses taken out of context
2. descriptive vs prescriptive
3. Old covenant vs New covenant
1. this is where a single section is taken from the Bible that appears to say one thing, but says something entirely different when it's read 'in context'
ex:
in proverbs, it says: There is no God
true!
if you read the rest of it, it says: The fool says in this heart: "There is no God"
this is an insanely simple example, but it shows the basic idea
2. in the bible, there is prescriptive (Jesus said: Love your enemies) where it's a command to the reader. and there's descriptive, where it's describing this that happened in the past: (Hit your staff on a rock and water will come out of it (spoken to Moses in the desert))
3. This is the issue that the page is trying to talk about. It's wrong. Plain and simple.
unfortunately this is a huge topic and cannot be discussed right here.
many of those other pages are simply wrong as well:
example
let's be quick about this.
Matthew 5:22 : [Jesus says] Love your enemies and pray for those who persecute you
Hitler wasn't a Christian. Period.
(on that same page, there's a quote from Hitler saying he's a Christian. He's lying.)
DbD79,
it's a pity that this is what you've seen of Christianity, I hope (and pray) that you will meet some true Christians.
it's true, many people who go to church are hypocrites, but I wouldn't way they're Christians.
It really is annoying that we're not supposed to talk about this :/
hope it hasn't gone too far already