It isn't, as you've pointed out many times. Most scientists in Darwin's time were creationist. It did not prevent them from studying Darwin and accepting the evidence for his hypothesis. That is because they behaved as scientists.
Then cease with the stupid and asinine statements that believing in special creation is unscientific. Since science CAN'T PROVE SQUAT about how the universe began, you can't state with any authority that special creation is unscientific. You can only rely on your bias to make such statements. There were no scientists there to observe it. Most of the major breakthroughs in science came long before Darwin. How did they ever do it - they couldn't possibly have behaved like scientists before Darwin existed, could they?