We have no examples of a human gene winding up in a bacterium through descent.
Viruses have the capability of injecting genes, and bacteria exchange genes. These are capabilities.
When you speculate about ID you are speculating about history. (Assuming you are not just blowing smoke.) When you speculate about history you are making assertions about the capabilities of historical agents.
When I speculate about ID, I can point to the existence of a money-making industry based on the principle. It is a fact.
I strongly suspect that your real complaint isn't scientific at all -- your position is primarily a religious one.