What is the difference between the Bible and the Qur'an?

If you confess Jesus is LORD and believe it in your heart that God raised Him from the dead you're saved(Romans 10:9)

1 Corinthians 7:10-11 CSB — To the married I give this command — not I, but the Lord — a wife is not to leave her husband. But if she does leave, she must remain unmarried or be reconciled to her husband — and a husband is not to divorce his wife.

Leviticus 18:15 CSB — “You are not to have sexual intercourse with your daughter-in-law. She is your son’s wife; you are not to have sex with her.

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Thank you for your question may God, further enlighten you.

John 20:26-28 CSB — A week later his disciples were indoors again, and Thomas was with them. Even though the doors were locked, Jesus came and stood among them and said, “Peace be with you.” Then he said to Thomas, “Put your finger here and look at my hands. Reach out your hand and put it into my side. Don’t be faithless, but believe.” Thomas responded to him, “My Lord and my God! ”

and said, ‘We have killed the Messiah, Jesus, son of Mary, the Messenger of God.’ (They did not kill him, nor did they crucify him, though it was made to appear like that to them; those that disagreed about him are full of doubt, with no knowledge to follow, only supposition: they certainly did not kill him-(An-Nisa 4:157)

Ive been pretending to be okay and acting as normal as possible, but Im actually completely heartbroken after a recent breakup. Its painful and really affecting me, to the point where I cant concentrate at work, Ive lost my appetite, I cant sleep, and It feels as if my whole world has been turned upside down. I loved him so much. He said so many cruel things to me and it made me realize he must not have loved me the way I loved him, or he wouldnt have said such horrible things. How do I handle the heartbreak and why cant I accept that he didnt love me and just forget about him?

There's no other God but Allah and Mohammad is his prophet.(Shahada)

And ˹remember, O Prophet,˺ when you said to the one1 for whom Allah has done a favour and you ˹too˺ have done a favour,2 “Keep your wife and fear Allah,” while concealing within yourself what Allah was going to reveal. And ˹so˺ you were considering the people, whereas Allah was more worthy of your consideration. So when Zaid totally lost interest in ˹keeping˺ his wife, We gave her to you in marriage, so that there would be no blame on the believers for marrying the ex-wives of their adopted sons after their divorce. And Allah’s command is totally binding. (Surah 33:37)

Everything is different and we can begin by comparing the confession of faith.

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1 John 2:22 CSB — Who is the liar, if not the one who denies that Jesus is the Christ? This one is the antichrist: the one who denies the Father and the Son.