How can you be saved while yet being in sin? You can't! It's impossible, according to scripture, to be saved prior to being baptized.
This is wrong. It is blood that washes your sin away. Not water.
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Acts 2:38
38Then 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 2:38-47 tells you how one is saved by remission of sins verse 38. Verse 41 of Acts 2 says they that gladly received his (Peter's) word were baptize, and about 3000 souls were added. Verse 47 of Acts 2 tells you that the Lord adds you to the church.
So, that's the principle for conversion and being added to the body of Christ which is his church.
Acts 22:16
16And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.
Mark 16:15-16
15And he said unto them, Go ye into all the world, and preach the gospel to every creature. 16He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
Belief + baptism = salvation