This intro to philosophy
what is the global cosmic fine-tuning argument for design
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I'm no expert, Vicki, but I think the argument goes something like this:
The universe in which we live is so perfectly adapted to the appearance of life that it is possible to believe someone wanted it that way. If our universe had had just a little more or little less material when the expansion began, no atoms could have formed, hence no stars, no planets, no life. Similarly, if the rate of expansion had been just a little faster or slower, the same result would have occurred. In fact, the universe in which we live has been found to have essentially 0 probability of existing at all! The fact that it does exist is a powerful argument for the existence of some God who wanted (for whatever reason) a universe in which the evolution of intelligent life could occur.