"just funning", LH, to borrow a phrase. I enjoy interpreting what people have written and not what they might mean. What you had written was trivial and noone would object. Such a sentence is usually started with "I too doubt..." or not said at all.

"I actually doubt..." is the start of a sentence by someone who thinks he says something not everybody would agree with. Such a start sounds pompous when followed by a triviality.

But since you meant to say something not trivial (utterly wrong and uninformed in my eyes, BTW) your 'actually' fits, of course. Only my deliberate misreading made it not fitting.

Wolfgang