1) Disorder and entropy are not the same - the second law of thermodynamics deals with entropy. There are no laws about things tending to “break down”. There are no laws about disorder as people normally use the word. The 2nd law is about spontaneous heat flow or, more generally, about the impossibility to perform useful work indefinitely. The twists put on it by creationists, including “organized complexity” are entirely fictional.
2) All systems do not tend toward decay and disorder - on Earth, there are many systems besides evolution that tend toward greater order. Some examples are ice crystals and snowflakes, cloud formations, ripples in sand and water, cracks in drying mud, streams sorting stones based on size, growing plants when “left alone”, and the development of a human from a single cell. These are clear examples of order arising on Earth.
3) Complexity can form from simplicity - take the example of hurricane formation. This is based on the idea of a pan of water with heat applied uniformly to its bottom developing a convection current that is more complex than the still water. Complex planetary ring systems arise from simple laws of gravitation. Complex ant nests arise from simple behaviors. Complex organisms arise from simple seeds and embryos. A good mathematical example of this is the Mandelbrot set which describes fractals:
4) Earth is not a closed system - our planet is not an isolated system. There is a constant input of energy from the sun. Without the sun, it is clear that no life would be possible on our planet. Sunlight (with low entropy) shines on the earth, and heat (with higher entropy) radiates off. This flow of energy, and the change in entropy that accompanies it, can and will power local decreases in entropy on earth.
5) Even in a closed system, pockets of lower entropy can form if they are offset by increased entropy elsewhere in the system - the second law *does* apply universally (to our universe). But it allows for a local decrease in entropy to be offset by increases elsewhere. Intriguingly, the maximum entropy of a closed system of fixed volume is constant, but because the universe is expanding, its maximum entropy is ever increasing, giving ever more room for order to form. Cool, huh?
6) Increasing order is not a violation of the 2nd law, even temporarily. A violation would be a decrease in entropy without a greater increase in entropy to go with it. Neither growth or evolution violate the 2nd law because both take advantage of local differences in entropy to get work done. Evolution requires only reproduction, heritable variation, and natural selection - ALL OF THESE PROCESSES OBVIOUSLY OCCUR. THEREFORE, THERE IS NO VIOLATION OF THE 2ND LAW - if anything, the 2nd law would need to be re-written to accommodate the reality of evolution occurring.
In short, order from disorder happens on earth ALL THE TIME. Creationists who claim otherwise are either deluded or being intellectually dishonest. I'm not sure which of those is worse.