Answer:
Just as Islam has five pillars so does iman have six pillars, the six pillars of iman that every Muslims must believe in to become a Muslim are;
1. Belief in Allah (swt)
2. Belief in angels
3. Belief in books
4. Belief in messengers
5. Belief in the hereafter/the day of judgment
6. Predestination if you would like some more information here is a link and it will give you more links when you go on it inshallah
http://www.Google.co.UK/#hl=en&xhr=t&q=the+six+pillars+of+iman&cp=20&pf=p&sclient=psy&safe=off&aq=0&aqi=&aql=&oq=the+six+pillars+of+i&pbx=1&fp=4fdd0fe036c2b5fe
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