So what's wrong with that?
Homosexuals want to impose THEIR belief system's definition of marriage.
"The author wants to impose his belief system's definition of marriage."
"So what's wrong with that?"
It's an increase in restrictions and a reduction of freedoms. Do you really want a reduction of freedom?
"Homosexuals want to impose THEIR belief system's definition of marriage."
They are not tying to impose their definition, they are trying to expand the current definition.
You seem to have trouble understanding the difference between expanding a definition and contracting one, or is that only with religious definitions where you believe religious considerations should override freedom?