Do I sin because of Adam?

[Mystic]

No there cannot be sinless humans. You can avoid sins, but never with permanence.

Sins are not blameworthy if they are inevitable. If there is no way for you to avoid sin, then you can't be blamed for sin.

The conclusion follows from the premises. It doesn't make sense to attack the conclusion and not the argument or premises that lead to it. So which premise do you have an issue with? Or is the argument invalid?

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I guess I can re-make the syllogism.

A property of sins is that they are blameworthy.
If we can't avoid a sin, it would not be blameworthy.
If we are bound to do at least one sin, then we cannot be blameworthy for doing that one sin.
Therefore we aren't bound to do at least one sin (1, 3).
Therefore it's possible to be sinless.