It is not permissible to say "The Messenger of Allah said" in relation
to a weak narration, and the above narration is weak.
The Prophet -- Allah bless and greet him -- said: "Islam is built on
five things." He did not say six.
The Companions were more knowledgeable of the Religion than us,
and `Abd Allah ibn `Umar said: "The pillars (arkan) of Islam are five,
and jihad is a good deed." I.e. it is not one of the pillars, much
less the one and only pillar.
The Prophet -- Allah bless and greet him -- said that the one pillar
(`amud) of Islam is salat. Not jihad.
When the Muslims go back to salat, then Allah -- if He likes -- will
give them back jihad. First things first. The Prophet said -- Allah
bless and greet him:
"The foundation (asl) of this matter [Religion] is Islam.
Its pillar (`amud) is prayer (salat). And its absolute
culmination (dharwatu sinamih) is jihad."
Narrated by al-Tirmidhi, Ibn Majah, al-Nasa'i, Ahmad and others from
Mu`adh ibn Jabal.