Yes it's true and Belgium's performance is currently very good and that's why Belgium is on the second position after came to Brazil in FIFA ranking points. And in the previous match with Netherlands I think Belgium was more aggressive but Netherlands used their luck to win with Belgium by one goal .
The FIFA ranking is defined by games won in the last year. A team will have more points than others, it will also depend on the difficulty it has faced in recent months. It is enough for a team to win more times, while another team draws more for having stronger opponents, ends up gaining less points. I'm not saying that's what happened with Belgium, I just think the ranking is always very subjective and doesn't always reflect the real situation of a team.
Belgium has been playing very good football, there is no doubt about that, now it remains to be seen if it is enough to defeat the greats.