2. Supporting and aiding polytheists against the Muslims. Allah Most High says (in the meaning):

"Whoever among you who takes them as allies is surely one of them. Truly, Allah does not guide the wrongdoers." (Soorah Al-Maaida 5:51)

This means to work for someone who is working against the Muslims and to help them, or to be in the army that is fighitng against the Muslims, or to work in a government that is kufr and helping to fight against the Muslims (which is every Muslim government today, yes even Iran!)--all would fall under this nullifier.


3. Anyone who believes that some people are permitted to deviate from the Shariah of Muhammad [saw] is an un believer by the word of Allah Most High (in the meaning):

"And whoever seeks a religion other than Islam, it will not be accepted of him, and in the hereafter he will be from among the losers." (Soorah Aal-Imraan 3:85)

For example, this would be to say that Christians and Jews can still follow their religion and don't have to follow the shari'a because they are people of the book.

4. Setting up intermediaries between oneself and Allah, making supplication to them, asking their intercession with Allah, and placing ones trust in them is unbelief (kufr). Eg. Praying to the dead to make du'a for you.