My wife was telling me a story today about when she was at a store and a group of people came up to her to "witness" to her. She told them she was a pastor's wife, but they seemed insistant. She explained to me what they were telling her and I had to admit that I have not heard of the doctrine that they taught. Why is it that churches believe different things when there is only one Bible?
One of the things that churches teach that seem to be inconsistant concerns baptism. First, the very meaning of the word "baptism" eliminates any kind of sprinkling. As we look through the Bible, we can see that Jesus commanded His followers to be baptized...
John 3:5 (KJV)
Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.
Mark 16:16 (KJV)
He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
Matthew 28:18-20 (KJV)
And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth.  Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
 Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.
Jesus taught us the essentiality of being baptized. Being baptized is symbolic of being buried as Jesus was buried so we must be fully covered by the water. We can find an example of this in Acts...
Acts 8:36-38 (KJV)
 And as they went on their way, they came unto a certain water: and the eunuch said, See, here is water; what doth hinder me to be baptized?
 And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God.
 And he commanded the chariot to stand still: and they went down both into the water, both Philip and the eunuch; and he baptized him.
Jesus said to baptize "in the name", and the disciples were obedient to this doctrine. They understood the name of the Father is Jesus according to Isaiah...
Isaiah 9:6 (KJV)
For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace.
The disciples knew that Jesus was the son...
Matthew 1:18 (KJV)
Now the birth of Jesus Christ was on this wise: When as his mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost.
...and Jesus told them that He was the Holy Ghost.
John 14:26 (KJV)
But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
Therefore, the disciples baptized in Jesus name.
Acts 2:38 (KJV)
Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Acts 8:15-16 (KJV)
 Who, when they were come down, prayed for them, that they might receive the Holy Ghost:
 (For as yet he was fallen upon none of them: only they were baptized in the name of the Lord Jesus.)
Acts 10:48 (KJV)
And he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days.
Acts 19:5 (KJV)
When they heard this , they were baptized in the name of the Lord Jesus.
It is very clear that Jesus expects us to be baptized in Jesus name. This is not a "church" doctrine, but a Biblical doctrine and history agrees that the first century church baptized in the name. I challenge you to study this doctrine for yourself.