If the only time allowed is the few thousand years of the bible, then of course evolution is impossible
I can see then why every observable aspect of life appears so magnificent as it is all due to a great all powerful creator.
The prime downside I see is the suspension of rational thought.
It makes is tough for a Galileo, a Copernicus, an Einstein
Someone posted a year or two back, the nobels won by Jews vs others
I am not sure that is apropos but it seems that critical and questioning thinking about natural phenomenon is a necessary attribute for the advancement of civilization