Shari’ah has taken great precaution in ensuring that nikah with an incompatible person does not take place. Therefore, Shari’ah advices one to perform nikah within those who are compatible and equal in the following factors:
Lineage.
Islam.
Piety.
Wealth.
Profession or occupation.
The Sayyeds hold the highest rank as far as lineage is concerned. The ‘Alawis and the Ansaris follow thereafter. However, all three will be regarded as equal in lineage and marriage between them will be regarded as compatible. Marriage of a Sayyed to anyone lower in status will be regarded as incompatible.wali (guardian). The wali will then have the right to annul the marriage. On the other hand, if the wali himself gets his daughter married to an incompatible person and feels that this person would be more suitable for his daughter, then it will be permissible for him to do so. Similarly, it will be permissible for a boy to get married to a girl who is not compatible to him.it will not be permissible for you to get married to a non-Sayyed without the consent of the guardian .** However, if you find a boy who is not a Sayyed, but is bestowed with the bounties of knowledge and good character; it will be permissible for you to marry him with the consent of your guardian**.And Allah knows best
http://www.askimam.org/fatwa/fatwa.php?askid=0e0e060b9b95c02f8492310ae62d93fd
Istaghfir’allah
If Islam has set conditions of lineage for marriage then all lectures on equality of Muslims and superiority only on the basis of Taqwa is wrong ( doesn’t matter what logic one have)
There are no conditions whatsoever for a marriage… yes there are some things we may consider based on the social values and compatibility… but saying a non-syed cannot marry to syed is like a non-brahmin cannot marry a brahmin