If there is a chemistry book which says to get HCL you should add NaCL and water, but people are adding iron and water and they say we do not get HCL does this mean chemistry is wrong? Or people are people are doing it wrong?
Chemistry can not be wrong because may people added NaCL and Water and they got HCL.

here are some things which is good reply to who say religions are source of war
2. Islam Prohibits Violence and Aggression, and stands for Peace and Justice.

Islam clearly prohibits all kinds and forms of aggression and violence against anyone, except in self-defense. Islam is a practical religion, meant to be implemented in every aspect of our life. Therefore, it realizes the fact that a person who commits aggression and violence against others will not cease these actions unless they are deterred by similar actions taken against them.

Islam also places very high importance on justice, and allows for aggressors and unjust people be punished accordingly, unless they repent before they are brought to justice. At the same time, Islam encourages people to forgive those who have wronged them whenever possible.

Evidence of these ideals can be found in the Holy Qur'an, which is the word of God revealed to the messenger of God, Mohammad peace be upon him. It can also be found in the Hadeeth, the sayings of Mohammad peace be upon him, and in his teachings to Muslims. A few examples of this are shown below from the Holy Qur'an:

"Fight in the cause of Allah those who fight you, and do not transgress; for Allah loveth not transgressors." (Surah 2, Verse 190).

"But if they cease (fighting you), Allah is Oft-Forgiving, Most Merciful." (Surah 2, Verse 192).

"But if the enemy incline towards peace, do thou (also) incline towards peace, and trust in Allah: for He is the One that Heareth and Knoweth (all things)." (Surah 8, Verse 61).

"The prohibited month, for the prohibited month, and so for all things prohibited, there is the law of equality. If then any one transgresses the prohibition against you, transgress ye likewise against him. But fear Allah, and know that Allah is with those who restrain themselves." (Surah 2, Verse 194).

" ... and let not the hatred of some people in (once) shutting you out of the Sacred Mosque lead you to transgression (and hostility on your part). Help ye one another in righteousness and piety, but help ye not one another in sin and rancour: fear Allah: for Allah is strict in punishment." (Surah 5, Verse 2).

"Nor can Goodness and Evil be equal. Repel (Evil) with what is better: then will he between whom and thee was hatred become as it were thy friend and intimate!" (Surah 41, Verse 34).

"O ye who believe! stand out firmly for justice, as witnesses to Allah, even as against yourselves, or your parents, or your kin, and whether it be (against) rich or poor: for Allah can best protect both. Follow not the lusts (of your hearts), lest ye swerve, and if ye distort (justice) or decline to do justice, verily Allah is well-acquainted with all that ye do." (Surah 4, Verse 135).

"God advocates justice, charity, and regarding the relatives. And He forbids evil, vice, and transgression. He enlightens you, that you may take heed." (Surah 16, Verse 90).

"And if ye do punish them, punish them no worse than they punished you: but if ye show patience, that is indeed the best (course) for those who are patient." (Surah 16, Verse 126).
for the furthere explaination of the above versus please visit:
http://www.al-islami.com/islam/religion_of_peace.php?p=2