The concept of Intelligent Design is credible and logical. Archaeologists regularly unearth artifiacts that need to be separated from those designed and those produced naturally. The methodology consists of characteristics that are recognized as evidence for design: stone arrowheads, for example, are identified by bilateral symmetry, consistent chip marks along both edges, and a particular size range.
The concept of Irreducible Complexity assigns to living organisms the fact that without certain parts, they would die. A cell is a dynamic, interconnected machine not unlike a car’s engine. One doesn’t remove a working part without causing the engine to stop. Also, one does not just add a part, especially while the engine is running, just anywhere. The new part would have to be the right size, the right shape and be in the right position to add function. There is no evidence that this can be done. Also, it would need to be able to reproduce along with the rest of the cell.
Self-directed assembly of living things is not possible without instructions.
Finally, if a designed artifact were found on Mars, the evidence of design would be a fact even though the designer remained unknown.
God bless,
Ed