Key word: synthetic, unnatural, artificial etc. It cannot be life if it wasn't created on its own. Synthetics are built and powered. Organics are born and are the result of evolution of millions of years. Organics can think and evolve. Robots cannot. They just follow their programming and even if they learn to make alterations to the original code they will still function within limits of that programming. They can't create something new that isn't based on any existing data.
So yeah, organic and synthetic life are based on mutually exclusive design principles. I've argued that point in my Synthesis thread. However, there's no reason to assume that synthetics couldn't exist that are just like us except for the way they came into existence, and in fact, the ME trilogy affirms that they can be that. "Robots" aren't synthetic life. They're too simple. We can't build synthetic life at the moment because our technology isn't up to it and we don't understand how thinking works, but nothing in the known laws of physics indicates that synthetic life couldn't exist.
Apart from that, attempts to affirm the specialness of organic intelligent life are empty because we don't know how our intelligence and creativity works. If we knew, it's most likely we'd find it not all that hard to replicate. In fact, if we knew, it's also likely it's just as "functional" as you claim synthetic life to be. There's every indication we're just organic machines, evolved to have partially non-deterministic decision processes because that proved to be an evolutionary advantage.
Check this definition of life. There's nothing in there that says it has to be organic. The most problematic aspect is (2), but only because most likely, we wouldn't find it efficient to design synthetic life that way. As for adaptation, intentional self-adaptation works at least as well as adaptation through random chance. It just requires understanding.