Many people believe ridiculous things, especially when at an impressionable age, but most will eventually, shuffle off such beliefs as time goes on and they become wise with age. However some remain and in the case of Christianity, this is the belief in creationism or its nefarious cousin Intelligent Design and hence they willingly deny biological and galactic evolution.
As this quote “There is probably no other notion in any field of science that has been as extensively tested and as thoroughly corroborated as the evolutionary origin of living organisms” from the Encyclopaedia Britannica explains to us, no rational person doubts; the Theory of Evolution because it has been examined and tested and the evidence has declared it as fact.
