What would you say to someone who was adamant that Allah was the only true God? Narrow is the gate

An atheist friend challenged me with this question: “What would you say to someone who was adamant that Allah was the one and only god?” (His small “g”). As far as I  am aware, my friend knows very little about Islam. Here was my answer, which did not try and prove why Allah (described in the Qu’ran, I assume) was, at best, an inadequate portrayal of God, but focused on why only the Bible provides the correct revelation of God.

Every Christian, when asked, is admonished to give an answer to those who ask for the hope that is within him: “But in your hearts revere Christ as Lord. Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect” (1 Peter 3:15).

In Matthew 7:13-14 Jesus says, “Enter by the narrow gate; for wide is the gate and broad is the way that leads to destruction, and there are many who go in by it. Because narrow is the gate and difficult is the way which leads to life, and there are few who find it.” “I am the way the truth and the life, no one comes to the Father but by me.” (John 14:6). “Very truly I tell you, whoever hears my word and believes him who sent me has eternal life and will not be judged but has crossed over from death to life.” (John. 5:24).

The Apostle John writes: “We proclaim to you what we have seen and heard, so that you also may have fellowship with us. And our fellowship is with the Father and with his Son, Jesus Christ” (1 John 1:3). John had seen the crucified Christ, but a thing most wonderful, also the risen Christ.

Why is it very possible you will reject the Jesus of the Bible? In Matthew 7:13-14 we read of Jesus saying, “Enter by the narrow gate; for wide is the gate and broad is the way that leads to destruction, and there are many who go in by it.

Roman 3 says “11 there is no one who understands; there is no one who seeks God (of the Bible) 12 All have turned away, they have together become worthless; there is no one who does good, Not even one; 13 Their throats are open graves; their tongues practice deceit. The poison of vipers is on their lips. 14  Their mouths are full of cursing and bitterness.

Unless Jesus has mercy on you and grants you repentance and faith in him, and by so doing bring you back from the spiritual death you deserve, you will remain in your sins. “No one can come to me unless the Father who sent me draws them, and I will raise them up at the last day” (John 6:44). The consequence of your rejection: “He who believes on Him is not condemned, but he who does not believe is condemned already, because he has not believed in the name of the only-begotten Son of God. And this is the condemnation, that the Light has come into the world, and men loved darkness rather than the Light, because their deeds were evil.” (John 3:18-19).” “… in flaming fire taking vengeance on those who do not know God and who do not obey the gospel of our Lord Jesus Christ, who shall be punished with everlasting destruction from the presence of the Lord and from the glory of His power, ….” (2Th 1:8-9).