The word "Deen" means Belief and Practices that is done by Muslim Community, also known as the Religion. Deen is the way of living, a complete code of life. Deen-e-Islam is a divinely ordained system of complete submission or worship to Allah (divinely God). Islam is the religion of Peace and Harmony. It teaches us the lessons of respect, love and tolerance.
"Manhaj" is an Arabic word meaning method, path or doctrine. In Islam, the systematic method of upholding Aqeedah and performing deeds is called Manhaj. 1. Qur'an, 2. Sunnah, 3. Ijmaa, and last 4. Ijtihad. (Sunnan Nasai Hadith 5401)