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

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

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)

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! ”

Is it okay if I am not interested to talk to any of my relatives as I saw the real faces in my brother's marriage as none of them helped us rather were a kind of disappointment and were talking bad?

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

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.

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

I vibrated my dogs shock collar while it was eating my other dog’s food and now it won’t eat. How do I fix this problem?

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)

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.

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)

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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.