Alex-db,
Thanks for your post. I am happy to point you in the direction of evidence for Christianity. First, I'd like to try and clear up the fallacies you mentioned regarding the Bible.
Many seemingly logical fallacies can be solved by looking deeper into scripture or by looking at the context in which something was written. Please understand that while the Bible is God-breathed (or God inspired) it is a Book written by man. Cultural aspects unique to the author are evident in certain books. For instance, Luke was a physician. So, the explanations in his book contain more medical terms.
As for why the people of Earth speak different languages, you are right. God thought man was getting too powerful. That isn't to say, though, that He felt threatened by man or anything of that nature. The Bible does say that God is a jealous god. As our creator and giver of life, he demands our full attention. He desires our worship. Who are we to question His actions?
Regarding slavery, keep in mind that the Old Testament is basically a history of the Jewish people. The Jews are God's chosen people. God favored the Jewish nation above other men on Earth. It may make more sense when placed in this context.
In the Old Testament, the Jews had to keep God's Law in order to remain in fellowship with Him. To put it simply, Jesus came because the man had rejected God's Law and was no longer fulfilling it. Actually, man was abusing the Law.
Through the sacrifice of Jesus, He set man free from the Law. This is the Grace you hear so much about. Perhaps it has been simplified so much that at times it doesn't seem to make sense. To truly understand it, one has to study it.
As for evidence, I am going to point you in several directions:
For a discussion on whether the universe was created, see
this thread.
For a discussion on whether the universe was created and whether the Bible is true, see
this thread.
For a discussion on whether truth is absolute, see
this thread.
For a discussion on the truth of the resurrection, see
this thread (in which you participated).
As for more in-depth evidence on the web, you can start your search here:
www.rationalchristianity.net
www.godandscience.org
www.carm.org
There are also some books that do a good job of explaining this subject:
For scientific, historical, and archaelogical evidence, "A Case for Christ" by Lee Strobel is excellenct.
For a logical case for Christianity, see "Mere Christianity" by C.S. Lewis.
Both of these authors are former athiests who have become Christians.
This should give you a good start. If you need anything else or have any questions, feel more than welcome to PM me.