Chances are, even if you are a Christian who has read the Bible, you haven't read this beautiful text from Deuteronomy 4:32-40. This is one I memorize from time to time (meaning, all the poetry doesn't always stick in my brain so I have to re-memorize it). One reason you may not have read it is because it comes right after Israel wipes out the population of conquered lands. We don't always know what to do with those texts, but it's important to me that we don't gloss over those particular contexts when we quote "beautiful" poetry from the Bible. We have to take the difficult texts with the cross-stitchable ones.
Deuteronomy is the catechesis of Israel's young who are being trained to possess a new land and be a people for God. Moses repeats their story going back to Abraham, particularly the Exodus, gives the 10 Commandments and many other stipulations of being God's holy people.
The following comes from the New International Version, which titles this section, "The Lord is God."
"Ask now about the former days, long before your time, from the day God created human beings on the earth; ask from one end of the heavens to the other. Has anything so great as this ever happened, or has anything like it ever been heard of? Has any other people heard the voice of God speaking out of fire, as you have, and lived? Has any god ever tried to take for himself one nation out of another nation, by testings, by signs and wonders, by war, by a mighty hand and an outstretched arm, or by great and awesome deeds, like all the things the Lord your God did for you in Egypt before your very eyes?
You were shown these things so that you might know that the Lord is God; besides him there is no other. From heaven he made you hear his voice to discipline you. On earth he showed you his great fire, and you heard his words from out of the fire. Because he loved your ancestors and chose their descendants after them, he brought you out of Egypt by his Presence and his great strength, to drive out before you nations greater and stronger than you and to bring you into their land to give it to you for your inheritance, as it is today.
Acknowledge and take to heart this day that the Lord is God in heaven above and on the earth below. There is no other. Keep his decrees and commands, which I am giving you today, so that it may go well with you and your children after you and that you may live long in the land the Lord your God gives you for all time."