Absolutely not. There is no reason to "default" to some other explanation. You would still need to provide evidence. The burden of truth lies with the person making the positive assertion. And if the evidence provided is falsified, then it is not valid.
Well let's see, according to what is considered scientific fact, an atom appeared out of nowhere, split and burst creating a universe that by a series of billions of coincidences that just happened to take place under the perfect conditions, each one happening under probabilities of a trillion to one, such as a bunch of rocks appearing, each perfectly round and a great ball of fire that just magically appeared along with great balls of gas that all just happen to give off light while the big one gives off so much light and heat and just happened to be just the right distance away from one of the big rocks that it makes it possible for life to develop, but wait, that wouldn't even have happened either unless another trillion to one condition had taken place in the form of a liquid substance that also appeared out of nowhere and covered just enough of the earth to create life while leaving large portions of land for that life to eventually crawl up onto after billions of years when it sprung limbs and then over millions of more years these creatures developed into giant reptiles who eventually died and the whole process started over again to finally develop into beings with thoughts, feelings, consciences, a sense of humor, an incredible intelligence and a powerful need to understand where we came from to the extent that we spend large amounts of our time, arguing on a machine that we created with our vast intellect that just happens to pick up signals from energy that also just happens to exist to make it possible for us to capture that energy and use it to create light, sound and heat.
I'm sorry, but I don't see how this is anymore believable or probable than my scenerio which is:
A powerful energy that has always existed and cannot be destroyed (which is proven to be a scientific fact) With a powerful intellect and emotion, caused a "Big Bang" like situation through the power of his infinite mind (Science is beginning to discover that our minds are capable of manipulating matter. If we can do that with only accessing 10-20% of our brains, imagine what we could do if we accessed 100% of our brains) and then molded the matter he created into a universe that worked perfectly together and made it possible for one of the planets he created to support life by making the conditions perfect for it. He created a large ball of fire in space that is just the right distance from the earth to keep it warm and give it light while protecting the earth with a protective layer to protect his creations from the harmful radiation that the sun gave off. He also created a planet that the sun would reflect off of just perfectly to light the earth even at night and created other planets and stars that made it easy for his creations to tell what time of year it was and how many years had gone by. He created 2 perfect beings full of all the same energies he was made of but in much smaller amounts and made plants and animals for them to eat and a way for them to reproduce. Over time, these beings and the animals around them did evolve to a certain extent depending on who they mixed their DNA with and where they lived. For instance, those in colder climates were lighter skinned and those in warmer climates became darker skinned over time and Animals evolved slightly over time as well depending on where they lived and mixing their DNA with other animals through mating.
This seems like a much more realistic scenerio than the Billions of Trillion to one coincidences that it would take for the other to be possible but each to there own I guess, I just wish atheists would stop forcing their "Theories" on us and our children and realize that Creationism isn't so unbelievable after all.
