However specificity (anything identified to have a specific purpose or intent) is only observed coming from intelligent agents and is very useful in identifying something with an intelligent source.
So how do you determine if a sequence is specified or not?
From what I have seen, the specificity argument is nothing more than the Texas Sharpshooter fallacy:
Texas sharpshooter fallacy - Wikipedia
All I have seen so far are examples of natural selection of pre-existing genes in the gene pool,
Those genes come from mutations.