Islam Question and Answer - “Religion is how you deal with others” is not a hadeeth

Praise be to Allaah.

This is not a hadeeth from the Prophet (peace and
blessings of Allaah be upon him) and there is no basis for it in the books
of the Sunnah. 

It was mentioned by Shaykh al-Albaani (may Allaah have mercy
on him) in the introduction to the fifth volume of Silsilat al-Ahaadeeth
al-Da’eefah, p. 11. He said concerning it: There is no basis for that,
not even among the fabricated ahaadeeth! End quote. 

Shaykh Ibn Baaz (may Allaah have mercy on him) was asked
about it and he said: 

This is not a hadeeth, rather it is a saying of the people.
End quote. 

And Allaah knows best.

Islam Q&A