I think pointing people to Hebrews is a good bet if they doubt the divinity of Jesus Christ.
He is the heir of all things. Through whom the world was created. He is the radiance of the glory of God. The exact imprint of his nature.Heb 1:1 Long ago, at many times and in many ways, God spoke to our fathers by the prophets,
Heb 1:2 but in these last days he has spoken to us by his Son, whom he appointed the heir of all things, through whom also he created the world.
Heb 1:3 He is the radiance of the glory of God and the exact imprint of his nature, and he upholds the universe by the word of his power. After making purification for sins, he sat down at the right hand of the Majesty on high,
Heb 1:4 having become as much superior to angels as the name he has inherited is more excellent than theirs.
He upholds the universe by the word of his power! Really think about those things.
If you are still struggling then the author of Hebrews continues by using Old Testament quotations.
The worshiping part here is the key thing. If he is not God then no one should worship because that would be a direct first commandment violation.Heb 1:6 And again, when he brings the firstborn into the world, he says, "Let all God's angels worship him."
As we read along verse 8 is even more interesting.
Heb 1:8 But of the Son he says, "Your throne, O God, is forever and ever, the scepter of uprightness is the scepter of your kingdom.This is just chapter one. Hebrews is a powerful exposition as to who Christ really is. The recipients of this letter were the Hebrews. It's a letter which is unique because it's not just written to Christians it is written also to those who are teetering on the edge of Knowledge without really having come to it. Building up and a massing head knowledge but never really accepting Christ for a multitude of reasons. The author painstakingly runs an intellectual gauntlet citing numerous OT sciptures explaining that Jesus isn't just some guy. He is greater then Moses who was held in high regard by the Hebrews of this time. He is a high priest after the order of Melchizedek. But that he is greater then that.Heb 1:10 And, "You, Lord, laid the foundation of the earth in the beginning, and the heavens are the work of your hands;
Heb 1:11 they will perish, but you remain; they will all wear out like a garment,
Heb 1:12 like a robe you will roll them up, like a garment they will be changed. But you are the same, and your years will have no end."
What man or prophet leads a sinless life? None. It's not possible. A deep study of the laws and expectations of God throughout the entirety of the bible show us that. That's why God came down to do the work for us. There was a plan in place before Eve even faced temptation.