Muslim is a person who is supposed to follow Islam. He/she could be a 90% Muslim, 50% Muslim, 10% Muslim or even 0.001% Muslim... depending on how faithful he/she is to the Islamic teachings. The problem is that faith is in the heart. only God can know if someone is good Muslim. We people can only judge based on appearance and behavior. Which is not always correct. source.
"We are a people to whom Allah has given honor and pride THROUGH Islam, and if we try to attain honor and pride through anything other than Islam then Allah will humiliate us and bring us low."- Umar al-Khatab.
Ya Allah, give me strength and undersatanding.