One of the original symbols of Christ, before the cross, was the fish. And when the cross did start being used as a symbol, the cross was not a cross at all, but a pole or a tree. Then it became a plus sign, then the T. And, it took hundreds of years to catch on. Only after the death of Christ became a prevalent subject in art did the cross or crucifix become a popular thing and became a convenient symbol. The letter X is also a symbol of Christ, as in X-mas.
I think back to that time, before books, and easy journaling. Cheap paper (vellum) and writing instruments were scarce. People who could write or read were scarcer. Faithful believers, like us today, wanted to preserve those sweet feelings and associations. The way they did it back then, they way humans have always done it, as soon as they could carve into rock walls, form clay, or draw, was to create symbols and icons- representations that reminded them or triggered those feeling and remembrances. Over time, the cross evolved into being a symbol for for Christ. But back to Mormons. To us, Christ’s death on the cross is about LIFE! Everlasting life! We believe that through the atonement of Christ, all mankind may be saved! (though we believe ALL men will be resurrected!) We celebrate a living Christ, a Christ who died on the cross for us yet was resurrected and is now preparing a place for us, and for you, too, no matter who you are. The actual logistics how he died is not the focus of the lesson. Had they chosen another form of death for Jesus, the end result would have been the same.
So, the symbol of the vehicle of his death, the cross, has not been adopted by Mormons. Now, to be sure, individuals will sometimes have appreciation for different symbols that, to them, remind them of Christ. For some, it may be a fish, or a nail, or a tree or a circle, the infinity sign, the Greek Alpha and Omega, the Hebrew Aleph, etc. Some may not have any association with any symbol at all to Christ, nor do they seek to wear or carry such things. Rarely do you see a man wearing a cross necklace or earrings. Right? This absence of cross jewelry does not reflect on his relgiousity, faith, or commitment. Correct? We are all individuals and will see inspiration in different things.