There would be no "mutations" without sin. The term "mutation" means to wander off course --- to go astray. Variety is not "mutation.
A mutation is defined as any alteration in the DNA sequence, biologists use the term "single nucleotide polymorphism" (SNP) to refer to a single base pair alteration that is common in the population. Specifically, a polymorphism is any genetic location at which at least two different sequences are found, with each sequence present in at least 1% of the population. Note that the term "polymorphism" is generally used to refer to a normal variation, or one that does not directly cause disease. Moreover, the cutoff of at least 1% prevalence for a variation to be classified as a polymorphism is somewhat arbitrary; if the frequency is lower than this, the allele is typically regarded as a mutation (Twyman, 2003).
DNA in any cell can be altered by any number of factors, including environmental influences, certain chemicals, spontaneous mutations, and errors that occur during the process of replication. Cellular biologist have yet to find a "sin" gene that causes spontaneous errors, or errors in replication.