The actual problem is what you are going to say when Jesus people come up with an argument: "Since you can't don't know everything about it, God did it. No need to research it further.". If you people are forced to choose between declaring to know it all or admitting that God did it with Intellingent Design, some declare that "I know all" it because the other side is being deliberately obstinate and constructed a straw man with checkbox options "I know it all." and "Perhaps God did it". The I know it all answer comes those people who were lured to play this checkbox with bad options game with the Creationists.

So, the whole we know it all-argument is a straw man that was born from creationists trying to get their theory accepted on the sole basis that not everything is known. It doen't quite work that way, the theory must be plausible or have some scientific value to be accepted. There's a vast multitude of bogus theories with zero proof and we can't waste resources to teach every single one to the kids. This is why new theories are viewed critically by the scientific community, to find out if it maps the truth and with what accuracy.

The point is that Scientists know already that they don't know everything. The problem lies in Scientists and laymen understanding differently the term of uncertainty. It's not black and white like a layman would think.

It is safe to ignore the we know it all-comments, as those people are just bad at explaining it and it's just an oversimplification so that layman would get it that the theory of evolution stands on firm ground, which it indeed does.