As someone who was never a witness, but who has been studying the Bible as my fiance is going through the same crisis that you, Leander are going through... (By the way take a look at your email. I have copied his post from a couple days ago, his first post here.)
Here are my thoughts...
If Noah's flood really happened, then that would mean that Noah would have had to make sure to get at least one of (but the bible says a pair) each animal that exists today, and that means down to every tick, flea, roach, frog, bird, dog, etc. Does that make sense? Could it even be possible that he was able to gather up all the animals that exist all over the earth today during that 40 days and 40 nights?
Doesn't the Bible say that you just have to believe in Jesus and that will bring everlasting life (I think its in the Book of John in the New Testament). If that is so, why would it be necessary to go out and try to convert others in order for God to love us. God gave us his son, Jesus, and Jesus died for our sins a "free gift" for each of us. Aren't we all witnessing here on this board, to our family and friends everyday. Does witnessing necessarily mean going door to door?
Just some thoughts I have had about these issues.