Do you think it would be "dreadful" if everyone believed in your God (assuming you believe in God)?
Yes, because any concept I might have of God would be imperfect and flawed.
The inference from your remark here is that you believe your God to be imperfect and flawed.
So to restate the question, if you believe your God to be perfect, would it be a "good thing" for everyone to believe in that perfect God?
And if you believe your God to be "imperfect and flawed," what have you been drinking?