1. The relationship between God, Jesus, and the Holy Spirit
2. How to attain eternal life (baptism, belief in Christ, etc.)
3. Once attained how to maintain the right to eternal life (confession, repentence, rituals, prayer, etc.)
4. The birth of Jesus (virgin birth, etc.)
5. Whether Christ's resurrection and ascension to heaven was physical or spiritual
6. When/if the millineum occurs
7. What hell is (eternal pain after death, death without resurrection, etc.)

Gal 1:6-9
6 I am astonished that you are so quickly deserting the one who called you by the grace of Christ and are turning to a different gospel--
7 which is really no gospel at all. Evidently some people are throwing you into confusion and are trying to pervert the gospel of Christ.
8 But even if we or an angel from heaven should preach a gospel other than the one we preached to you, let him be eternally condemned!
9 As we have already said, so now I say again: If anybody is preaching to you a gospel other than what you accepted, let him be eternally condemned!
(NIV)

It can be difficult to find a regular worship service that actually focuses on teaching the bible.

• Visions
• Other people
• The Bible
• Preachers, prophets, evangelists

Both blood and water are for cleansing.
Water cleanses your external body; blood cleanses your inner system.
Water is used to symbolize cleaning your body.
Blood is used to symbolize cleansing of your spirit.