Why is believing in a sentient being that exists outside of time with a higher intelligence than us wrong?
It is a belief - a hypothesis. There is always room for faith and belief in science - that's how hypothesis start. Someone dared to challenge science. Science must always be challenged. To say that we know everything is wrong - we can not possibly know everything, which is why science is so fascinating.
Einstein's theory of relativity came into being because he believed it was true. Galileo found the earth was not the center of the universe, because he believed it was true.
These beliefs are then tested and tested and tested until they become a Scientific theory. However, no matter how much something is tested by humanity, we can not infinitely test EVERY possibility.
A theory means it's likely to be infinitely true more than any other concept or hypothesis.
All science starts with a belief or a questioning if something is true, and then testing it out to see if it is.
Telling someone their idea is wrong without ample proof or argument isn't exactly the most intelligent thing to say.
Frankly, the Big Bang and Creation are very logical ideas. The Big Bang can happen as well as a sentient being creating our universe. Evolution on a small scale has been proven through heredity, and yet large scale evolution has not.
To say this is this and that is that is just not cool. Creationism as well as any other scientific theory is a theory - but a theory is not written in stone. Dogging on someone for challenging a theory is attacking the field of aspiring scientists everywhere. All the great minds dared to believe and to challenge...not to conform.