I can agree with that statement there. However, I would submit that there is a period of learning and adjusting. Just as a child needs to learn what is right and wrong, a newborn Christian needs to be taught what is right and wrong. Like I mentioned before, the practicing homosexual might actually believe that there is nothing wrong with homosexuality, based upon social acceptance and possibly even being told by false teachers that it is ok.
It might take some teaching by Godly christians for them to learn that what they are doing is not ok with God. Once they realize that it is in fact not ok with God, then the real test of their Salvation begins. Do they continue in their sin, showing no change whatsoever and thus showing that most likely they did not get saved; or do they stop what they are doing, showing that there has indeed been a change?