You seem to not know how cells replicate and how mutations work. A quick search on "cell replication" turns up with this:
Cell replication is not a very complicated subject at root (which is why we Swedish students study it in 9th grade). However, there are some creationist sites that make wild claims. One such claim is that mutations in cells are unable to add new information. They argue that if mutations were true, everyone would become a mutant and die. This essay posits that the claims of "cells are unable to add new information" and its corollary, "everyone would become a mutant and die," are false.
Firstly, we are built of different sorts of cells (liver cells, brain cells etc). Each cell has a core called the nucleus where DNA is located. DNA is the blueprint of our body, and all cells contain DNA inherited from our parents. Different parts of the DNA are active or inactive depending on the cell's purpose (i.e. liver and brain cells contain the same DNA, but different parts of the DNA are active). DNA is a long strand made of carbohydrates and nitrogenous bases. There are four different types of nitrogenous bases: guanine, cytosine, adenine, and thymine (abbreviated G, C, A, and T respectively). The nitrogenous bases fit together on the DNA strand as shown in the picture below. Notice that A pairs with T only, and G pairs with C only. Any other combination is impossible due to the fact that if they were paired differently, the double strand would be too short of too long in places. Only when the pairings are A-T and G-C is the DNA an appropriate size.
http://www.ndsu.nodak.edu/instruct/brewer/images/
DNA is filled with both active and inactive sequences. The active sequences are regularly used to send information to the ribosomes, which create the amino acids that are needed to form proteins. As their namesake implies, inactive sequences do nothing.
Cells have a certain life span, and must replenish their numbers by replication. Replication begins by the double stranded DNA denaturing (separating into two strands). Each half then rebuilds the opposing side then the fully formed DNA moves into its own cellcore (the whole cell duplicates itself but I will focus on what happens in the core since that is the only part pertinent to mutations).
Most mutations occur when the DNA halves rebuild the opposing side. The chance of is around 1/10^11. There are approximately 6 billion basepairs in each cell, meaning a mutation should occur every 20th replication cycle. The most common mutation is a point mutation: only one base pair is changed. On average, every cell divides 30 times, which means each cell should contain one or two mutations on average.
If there are so many mutations in our body, how are we able to keep on living? Do not these mutations kill us, as the creationist websites conclude? No, and the reason for this is simply that most mutations have little or no effect whatsoever. A mutation is most likely to occur in an inactive region since inactive regions comprise most of our genome. This means that nothing happens. If a mutation does occur in an active region, it is possible that the change is ineffectual since different genes can create the same amino acid. For example, a mutation may occur in the sequence ACG, in which the C is removed, but it is just replaced by another C. In other cases, ACG may be altered to CCG. Still, there is no effect since many nucleotide triplets code for the same amino acid. In the case where the mutation does change the nucleotide triplet, the protein produced (or not produced) may either help or hinder our bodily functions.
The claims of the creationist websites are outlandish and embarrassing in light of reality. As evidneced in this paper, mutations occur, which add or subtract new information to the cell. And these mutations, most of the time, have no effect at all, much less a deleterious one
http://www.christianforums.com/t69514&highlight=cell+replication