Unaccustomed as I am to public gambling, I'm quick to offer a wager because the prideful and their money are easily separated. If, as they insist, no references to Christ claiming His divinity can be found in the Bible, surely they'll have no problem with betting a buck for each and every Biblical passage that proves them wrong.
Inevitably, the unbeliever's jaw will fall open as they struggle to catch their breath, offering a prayer to the God in Whom they don't believe to extricate themselves from the imbroglio of their own making.
In actuality, there are at least fifty passages in which Christ specifically admits to His divinity including:
Not everyone who calls Me 'Lord, Lord' will enter the Kingdom of heaven, but only those who do what My Father in Heaven wants them to do. When the Judgment Day comes, many will say to Me, 'Lord, Lord! In Your name we spoke God's message, by Your name we drove out many demons and performed many miracles!'