Question: How can I, as a Muslim, be assured of paradise?

Answer: First we need to define what Paradise means in the scriptural revelation of God. Acts 3:19-21 states:

Repent ye therefore, and be converted, that your sins may be blotted out, when the times of refreshing shall come from the presence of the Lord; and he shall send Jesus Christ, which before was preached unto you: Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.

So here we see that when Jesus returns form heaven there will be a restitution of all things back to what they were before Adam sinned, rebelled against God. At that time this world will undergo a makeover that will be a Paradise. Jesus said the meek shall inherit this earth, so the reward of the saved is to inherit this earth with Jesus and to co-rule over the nations with him in the newly established Theocratic Government that will be established in Jerusalem with Jesus sitting on the throne of David ruling over Israel and all the nations who will come up from year to year to keep the feast of Tabernacles and pay homage to Jesus and his God and his Father - YHVH

See Zechariah 14:16 ¶ And it shall come to pass, that every one that is left of all the nations which came against Jerusalem shall even go up from year to year to worship the King, the LORD of hosts, and to keep the feast of tabernacles. Read all of Isaiah chapter 11 which shows what the life in the new age will be all about. Truly, it will as much a Paradise as Adam and Eve lived in before they were caste out of the garden, and the whole earth went through a dramatic change to that now the scriptures reveal that all of creation is waiting for the sons of God to be revealed so that things can get back to the way there were before Adam rebelled.

Romans 8:16-22: The Spirit itself bears witness with our spirit, that we are the children of God: And if children, then heirs; heirs of God, and joint-heirs with the anointed one; if so be that we suffer with him, that we may be also glorified together. For I reckon that the sufferings of this present time are not worthy to be compared with the glory which shall be revealed in us [when we are resurrected and inherit this earth with Jesus]. For the earnest expectation of the creation waits for the manifestation of the sons of God. For the creation was made subject to vanity, not willingly, but by reason of him who has subjected the same in hope, because the creation itself also shall be delivered from the bondage of corruption into the glorious liberty of the children of God. For we know that the whole creation groans and travails in pain together until now.

What a glorious future we have waiting for us in the Paradise we will have as our inheritance from our God and to have this as our when we are resurrected to rise up and meet the lord Jesus in the air and to be with him for ever more, ruling and serving him in the Theocratic Government he will be the head seated on the throne of David in Zion, where God has placed His name - YHVH forever! That is the Paradise that all who believe in the lord Jesus are going to inherit! Amazing future, amazing Grace!