You said -- "Do all that ... THEN you're a Christian."
Here's the very specific "formula" (if you will)
Romans 10:9-10
9 that if you confess with your mouth the Lord Jesus and believe in your heart that God has raised Him from the dead, you will be saved.
10 For with the heart one believes unto righteousness, and with the mouth confession is made unto salvation.
That's about it, as far as the Bible is concerned (which means, as far as God, the Holy Spirit, and, Jesus Christ are concerned).
Of course, you can add a lot more personal knowledge to that equation (by reading the Bible, studying, praying, going to church -- and so on), but you won't add any more to your salvation, than just those two verses.
Regards,
Star Traveler
The Lutheran religion also believes that you must be baptized, but you're spot-on. It's not really a very hard concept to understand. Anyone else that puts themselves between us and God is just out for your hard earned cash-o-la, IMHO. :)