Question:  Dear scholars, As-Salaam `Alaykum  
Would you please shed some light on the Ahmadiyyah or Qadyaniyyah movement?  Jazakum Allah khayran.  
Answer:  
Wa`alykum As-Salaamu Warahmatullahi Wabarakaatuh.  
In the Name of Allah, Most Gracious, Most Merciful.  
All praise and thanks are due to Allah, and peace and blessings be upon His  Messenger.  
Dear sister in Islam, thanks for showing great keenness on understanding the  teachings of your religion and we pray to Allah to keep us firm on the Straight  Path.  
As regards the question you posed, we quote for you the 
fatwa issued by  Islamic Fiqh Academy on Qadyaniyyah, with slight additions from other  sources. It goes as follows:  
Definition:  
Qadyaniyyah (also known as Ahmadiyyah) is an Indian-based movement that was  established under the patronage of the British colonial powers in 1900 for the  aim of driving Muslims away from their religion and, most definitely, the  religious duty of Jihad, which, they feared, might be used to stage rebellion  against the British occupation. The mouthpiece of the movement was Religions, a  magazine that was issued in English at that time.  
Dogmas and Ideology:  
Ghulam Ahmad, the founder of the movement, began his activities as an Islamic  caller to attract as many supporters as he could. Later, he claimed himself a  reformer and a divinely-inspired man. Afterwards, he said that he was the  awaited Mahdi. Later on, he claimed prophethood and even said that his  prophethood was much better than that of Prophet Muhammad, peace and blessings  be upon him.  
The followers of this group believe that Allah, Glorified be He, performs  some acts befitting the mortals, like fasting, praying, sleeping, and even  committing mistakes. But Allah Almighty is Far Exalted above what they say!  
A Qadyani believes that his lord is English as he speaks to him in English.  He also believes that Muhammad, peace and blessings be upon him, is not the seal  of Prophets and that Allah Almighty sends new prophets according to time and  need, and that Ghulam Ahmad is the greatest prophet. The followers of this sect  also believe that Angel Gabriel used to come to Ghulam Ahmad and convey  revelations to him. In addition, they say that the only accepted book is the  book presented by Ghulam Ahmad, his words are the only accepted words and that  all prophets stand under his control. Furthermore, they believe that their book,  known as Al-Mubeen is a heavenly-revealed one.  
They continue spreading their false ideas by saying that they have a new  religion totally different from all other religions and that the companions of  Ghulam Ahmad are like the Prophet’s Companions. Moreover, they say that Qadyan,  their leader’s place of birth, is like, or even better than, Makkah and Madinah,  so they take it as their prayer direction and a center of pilgrimage. They call  for ignoring Jihad and showing complete obedience to the British empire, because  it represents the ruler to whom obedience is due. To them, every Muslim is a  Kafir (disbeliever) until he converts to their belief, and that anyone who  marries a non-Qadyani is considered an unbeliever. They also allow wine, opium,  intoxicants and drugs.  
In 1914 the followers of Ghulam Ahmad were divided into two groups. The  overwhelming majority of his followers belong to the first group known as  Qadyanis and were headed by Bashiruddin Mahmud, the second successor of Ghulam  Ahmad. The second group known as Lahori, and founded by Muhammad ‘Ali Lahori, is  a minority among the followers of Ghulam Ahmad. The second group have a less  striking tone of their principles by claiming that they do not believe in Ghulam  Ahmad as a prophet in the real sense of the term but as Mujaddid (a renovator).  However, they still believe him to be true in all other claims, which led  Muslims to regard them also as outside the pale of Islam.  
Qadianiyah in the Eyes of Muslims:  
On the month of Rabi` Al-Awwal 1394 A.H. (April 1974 A.C.) a large conference  was held in the Muslim World League headquarters in Makkah and was attended by  many representatives of international Islamic organizations. The communiqué  issued by this conference branded this group as Kafirs (unbelievers). It also  recommended that all Muslims should stand to face this group and never deal with  its members and not to bury them in Muslim cemeteries.  
Moreover, Qadyaniyyah followers have good relations with Israel that helped  them issue a special magazine (that stands as their mouthpiece) and many other  pamphlets that are distributed all over the world.  
Conclusion:  
Based on the above-mentioned facts, we can say that Qadyaniyyah is a deviant  group that has nothing to do with Islam. Muslims are to be aware of them  especially after they have been branded as Kafirs by all scholars.  
For more information, you can read the following:  
- Muhammad Iqbal, Islam and Ahmadism, Lahore-Pakistan, 1976. 
- Syed Abul  Ala Maudoodi, The Qadiani Problem, Karachi, 1956. 
- Ehsan Elahi Zaheer,  Qadiyaniat: An Analytical Survey, Lahore-Pakistan, 1976. 
- Mahmood A. Ghazi,  Qadiani Problem and Position of the Lahori Group, Islamic Book Foundation,  Islamabad, 1991. 
- Bashir Ahmad, Ahamadiyya Movement: British Jewish  Connections, Islamabad, 1994. 
- Mane`Bin Hammad Al-Juhani, Al-Mawsu`ah  Al-Muyassarah fi Al-Adyan wal Madhahib Al-Mu`asirah.  
Allah Almighty knows best.  
Read  Source
http://www.irshad.org/exposed/fatwas/islamonline.php