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Ask your Mormon friends/loved ones if Joe Smith’s definition of the word beginning is acceptable to them personally. He said there’s no such thing as a time prior to which there is nothing. A simple example would be the beginning of someone’s marriage. If someone was married on a certain date, it certainly didn’t exist before that time. Simple explanations from dictionaries will give them something to think about while it takes away any judgmental position from you.
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Teachings of the Prophet Joseph Smith, pp. 353-354 “There is no such thing as an ultimate beginning, a time prior to which there was nothing, any more than there ever can be an ending, a time past which there will be nothing. … The intelligence of spirits had no beginning, neither will it have an end. That is good logic. That which has a beginning may have an end.”