The following argument isn’t necessarily an argument for Christianity so much as it is an argument for something beyond this physical universe such as the concept of God.
Atheists will say that science explains everything and there is no evidence for God, with the explanation for the universe from science being the big bang and then eventually evolution here on earth and so the premise is that if the big bang and evolution are true it disproves religion. There are several problems with this line of reasoning. The first being that it doesn’t completely answer the question of where did we come from. What you are really saying by the big bang is everything spontaneously popped into existence. It really can’t be stressed enough what the implications are of this idea. Gravity would have popped into existence with the right proportions (if the amount of gravity generated in proportion to mass was incorrect then the universe couldn’t work). Time would have come into existence. All matter and energy would have come into existence and enough of it and also with enough variety. All the rules of the physical universe that we observe popped into existence. Everything just came from one explosion and the explosion itself has no creation either always existing or itself popped into existence.
Evolution has a similar problem. Evolution is an explanation for how species can change over time, it is not an explanation for how life came. Evolution requires life to already exist in order for it to function. Evolution posits that human beings came from some former species and then another former species eventually going all the way back to an original single celled creature. Where did this original cell come from? Science really has no real answer for where that original cell might have come from, currently the best explanations science has to offer boil down to this idea that if you take the right chemicals let them mix together and give it enough time out comes a single cell. This cell would have to have all the basic requirements for a cell to work, a cell wall, the ability to consume energy, the ability to reproduce, DNA and so on. Imagine taking a bunch of raw materials such as sand, different metals, oil, etc, mixing together and out pops a computer. It would never happen, even with millions of years.
Some have argued that there are maybe an infinite number of universes and so therefore an infinite number of chances for a universe to come into existence with the correct proportions of things and enough chances for life to exist, even if this were true it still would run into the same exact problem as described above. Where would these infinite universes have come from?
One might say it is just as arbitrary for a perfectly working universe to pop into existence as it is for some God to always exist and decide to create things. The problem is there is a sense of purpose to our universe in the same sense that there is a sense of purpose to a computer. A computer has millions if not billions of complicated parts all working together and so in that sense it has a purpose, it is not random. Now consider “The Library of Babel” it is a story about a hypothetical universe in which there is an infinite library and in this library you have every single book that could ever exist by taking random combinations of letters and symbols and combining them into books. Most books are meaningless garbage, some books contain a little bit of a story but then more meaningless garbage. Somewhere in this library you would find the Bible, the very letters in this document I am writing right now and so on. This hypothetical story is used to argue that when you have an infinite number of chances for a universe, eventually you get a universe like the one we live in right now. The issue is this story assumes there are rules to randomness, if there were no rules to randomness then it would never work. There is an alphabet and when you combine the letters in a certain way they have meaning, there are books with pages and so on. Essentially the story is sneaking in order while claiming to explain order. Why have an alphabet? Why have words? Why have books? Why have anything at all? Assuming there is no God then a more reasonable assumption is that nothing should exist because something existing is dependent on something else or if you are going to say everything just pops into existence over an infinite number of chances, then you should equally say at any moment we are going to randomly cease to exist.
Moving away from the physical, if there is no God then there is no such thing as morality, there is no such thing as meaning, there is no such thing as purpose, everything is random and yet no one truly behaves this way or believes it deep down, even atheists. People say murder is wrong, but why? Without God, to say something is wrong is arbitrary, an atheist might argue that evolution over time conditioned us to view murder as wrong because murder decreases the odds of our species continuing to exist, but if life was purely explained by evolution then it should always be a good thing for people to be as selfish as possible. If a man were to rape a woman then he just increased his odds of his genetics moving on to the next generation, yet we consider this wrong. All human beings have a sense of right and wrong and a sense that there should be a deeper meaning to life, the universe, and everything. This would point to the reality that there probably is purpose, morality and meaning, but purpose and morality can only come from an ultimate being giving it purpose.
There are even more arguments for the existence of God and none of these arguments by themself proves that God exists, but that’s not the point. If you take any religion (including atheism), it is impossible to prove it is actually true, instead you must take the sum of the evidence for and against a position and weigh it. In the case of the existence of God vs no God at all, it is very reasonable to argue there is more evidence pointing to God rather than the contrary.
Browse related topics on faithaftermormonism.org:
Books and Videos:
“The reason for God” by Timothy Keller,
“Mere Christianity” by C.S. Lewis,
“I Don't Have Enough Faith to Be an Atheist”
“Five proofs of the existence of God” by edward feser,
“God’s crime scene” by J Warner Wallace