All we can do is create simulations of intelligence. Mostly it's signal processing, pattern recognition and fast recall, not real 'intelligence' and reasoning.
Are you saying it would be impossible to replicate the human mind in a computer? Our minds are signal processing, pattern recognition, and fast recall as well. When born, we receive input and instructions by way of learning. We use patterns and analysis to make decisions. Our 'feelings' are based on chemicals such as dopamine, serotonin, etc being released in response to certain actions and conditions. If a computer program was made with the same conditions as the human mind at birth, I see no reason why this would not be possible, and then it could have intelligence and reasoning that surpass us.