The Religion of Islam is the religion which Allah sent Prophet Muhammad[Sallallaahu `Alayhi wa Sallam] with.

Allah the Exalted said: ‘Muhammad is not a father of any of your men, rather he is the Messenger of Allah, and the last of the Prophets.’
[Qur`an Suratul Ahzaab 33: A #40]

Allah the Exalted said: ‘Today I have perfected for you your Religion, and completed for you My favor upon you, and have chosen for you Islaam as a religion.’
[Qur`an’ ~ Suratul Maa’idah 3: A#5]

Allah the Exalted said: ‘Verily the religion with Allah is Isam’.
[‘Qur`an’ ~ Surat Aali ‘Imraan 3: A #19]

‘And whoever takes other than Islam as a religion, it will never be accepted from him, and he will be in the Hereafter from the losers.’
[‘Qur`an’~Surat Aali ‘Imraan 3: A #85]

‘Whoever reads Surat `Al-Kahf ‘ on the day of ‘Jumu`ah’… will have a light that will shine from him from one Friday to the next.’
[Narrated by al-Haakim, 2/399; al-Bayhaqi, 3/249. It was classed as Saheeh by Shaykh al-Albaani in Saheeh al-Jaami’ ~ # 6470)]