Iman and Jihad

Faith in God and belief His Prophet is to be strong, fanatically to be kept from feeling a doubt. Therefore, Believers are required to jihad (struggle) to uphold the faith . Because jihad is a stake for the establishment of religion. Jihad is never lost or completed in the span of the history of the condition of Muslims.
The Word of God in surah Al-Hujurat 15:
"Those who believe only those who believe in Allah and His Messenger. Then they did not hesitate, and they strive with their wealth and their souls in the way of Allah. They are the right people. "

People who believe, faith is sometimes strong and weak kadang0kadang faith. Faith they have ups and downs. Because state fluctuates faith, then there should be development efforts to achieve perfection in the ladder of faith.
For Muslims, actually to eliminate the sense of doubt concerning faith is not difficult, provided that cling to the teachings of the Qur'an and Hadith. It's just that sometimes we are affected in the environment, therefore it is ordered to the adherents of Islam to jihad. In the Qur'an we often encounter the words of jihad alongside the words of faith.
In general, people simply mean that jihad is always associated with war, took up arms and violence. But on the other side can also be interpreted as a defense of faith. Jihad keep faith out of the war is that we fight must passions and demons that is in us that in fact much more difficult than the physical jihad (war).
For jihad in Allah's way, people do not have to take up arms on the battlefield, but with their wealth, or perhaps with the words or actions are considered as jihad. The door of jihad is very broad and many different forms, for the Islamic jihad is a struggle that must be done throughout the ages.