Really? In spite of all our knowledge, intelligence and technology no one has yet been able to create as much as a single new gene that performs a single new function. We alone have some 30,000 such genes.
I'm pretty sure you're wrong about this. I know of several groups that are doing de novo protein design, and have made entirely new proteins that are catalytically active. If you have a working protein, synthesizing a gene for that protein and getting it expressed would be trivial.