As-Salamu ^alaykum..
Praise be to Allah, the Lord of the worlds. May Allah raise the rank of our master Muhammad and his Al and Companions and protect his nation from that which he fears for it. Thereafter:
Brothers and sisters,
Know that Islam is the only religion Allah accepts from His slaves and the only religion He ordered His slaves to follow. The one who performs the greatest right of Allah on the slave by worshipping Allah alone, not taking any partners to Him, and believing in the message of the Prophet Muhammad, will be granted everlasting bounties in Paradise. He who takes for himself a religion other than Islam and dies on that status will be a loser on the Day of Judgement and his eternal abode is Hellfire, where the torture does not cease nor decrease. Allah does not forgive the one who dies non-Muslim, nor will any of his good deeds done in this lifetime be accepted from him. Surat Muhammad, Ayah 34: means: [Those who blasphemed and block away from the ways of Allah and die as blasphemers, Allah shall not forgive them.] Surat an Nisa’, Ayah 48: means: [Allah does not forgive that one associates parteners with Him, and He forgives whatever is less than that for whomever He willed.] Ya lateef..
Knowing everlasting enjoyments await the Muslim in Paradise and everlasting torture in Hellfire awaits the one who dies a non-Muslim should make every Muslim anxiously prioritize holding tight to his Religion. The one who is desirous of having his ending a good one will do his utmost to comply with all what is obligatory upon him and avoid what is forbidden, and above all, will endeavor to avoid anything which will invalidate, interrupt, and terminate his Islam–namely apostasy. Of greater priority is warning the Muslims against what would take them out of Islam and lead them to be one of the eternal inhabitants of Hellfire over other issues in the Religion with less drastic consequences. For this reason, the scholars of Islam included chapters on apostasy in their books to elucidate what causes a person to commit apostasy and the judgements concerning him, in an effort to warn the people from committing any of it. The one who does not know evil is more likely to fall in it, and the one who learns the chapter of apostasy would have his eyes open and his heart guarded to avoid committing this grievous sin.