People can have scientific opinions and they can have religious opinions. Intelligent Design is a legitimate philosophy. It is not a legitimate science.

(It's only a legitimate philosophy to the extent that its promulgators are not making stupid and usually false statements about evolution or making up pretend statistics. Example: Jonathon Well's "icons of evolution" is blathering nonsense no matter how it's cut up.)

The only people who reject evolution are the ones whose "understanding" of it amounts to barbershop gossip.