You are 100% incorrect.
> The Department of Education Organization Act is a United States federal law enacted in 1979, which created the Department of Education.
> In the Senate, 69 voted in favor and 22 voted against separating education from the Department of Health, Education, and Welfare.[3] In the House of Representatives, 215 voted in favor and 201 voted against.[4] President Carter signed the bill on October 17, 1979.[1]
> https://en.wikipedia.org/wiki/Department_of_Education_Organi...
Please list the departments and cite the executive orders creating each, because I think you will find that this is far less than half (and, unless you are using a non-standard definition of what constitutes a department in the US federal government, that the proportion is actually 0%.)
(A sibling commenter has demonstrated that the single example you provided is wrong, but its not just a poorly-chosen example.)