It sounds like you are sincere in asking this, and for that reason you deserve honest, sincere answers. So I will try to give you one.
Yes, it does take faith to believe in what scientists tell us, because we cannot do the experimentation ourselves, or observe the evidence that they evaluate, or do the mathematical calculations that they use to prove their theories (or at least come ever closer to the truth). So when scientists tell us that gravity is what holds us to the Earth, we just have to trust them, even though we can't prove it ourselves. When they tell us that E=MC^2, so massive energy is released when the atom is split, we just have to trust them. When they tell us that geological and astronomical evidence shows that the Earth is billions of years old, we have to trust them. So yes, we do take these things, and everything else that science tells us, by faith. And sure enough, we don't fly away from the earth, the atomic bomb worked (E=MC^2), and we have found much physical evidence that the Earth is indeed billions of years old.
So why don't we just ask God for the answers? Many of us have, and have never heard God tell us the answers. I can ask God right now: "God, what chemical formula will give us a cure for cancer?" I actually just did ask God that. Even closed my eyes and folded my hands, and guess what? God didn't tell me. It would be so much easier if He did, but He doesn't.
Ask God how to create a machine that will let you talk to people all over the world instantaneously. He won't tell you. But science can, and did. Ask God how to cure smallpox. God won't tell you. But science will, and has, and smallpox is virtually nonexistent today - not because God gave us a cure, but because hard-working scientists did.
Believers in God will tell you that God has spoken to them, and given them answers. Perhaps He has, but if so, then why didn't they ask God the hard questions, the ones that science is still working on. How can we cure cancer? How can we feed the hundreds of millions of people who are starving in this world? How can we stop wars and live in peace? If I really believed that God talked to me, or somehow gave me answers, these are the questions that I would be asking.
Besides the lack of reliable answers from God, there are other, more practical reason that we who do not believe in God (or who don't know if God exists) have faith in science and not in what God might tell us.
Most important, we can't prove what God tells us and indeed, we've often found that what God has told us (or what religious leaders tell us that God told us) is untrue, or extremely unlikely. Snakes talked, and walked on all fours, back in the Garden of Eden? Maybe, but hard to believe and impossible to prove. On the other hand, what science tells us can be proven and often reliably demonstrated. Science made it possible for man to land on the moon, to explain earthquakes and volcanos, to predict the weather, and (regardless of faith-based religious argument) to tell how old the Earth is, why animals and plants are different on the various continents, and why apes and humans are so similar, and yet so different.
Also, God doesn't seem to be consistent. A Catholic priest says God told him that we need to confess our sins to a priest, pray to saints, say the Rosary, and not eat meat on Fridays. Another Catholic priest says God told him that it's okay to eat meat on Fridays. A Protestant minister says God told him that you can't confess to a priest, or pray to saints, and saying the Rosary is meaningless. Oral Roberts said God told him He'd kill him if he didn't raise enough money. Okay... And Pat Robertson says God told him all kinds of things that most people, even Christians, think are crazy. It seems that God tells us whatever we want to believe, or whatever our religious leaders tell us to believe.
Another reason it is easier to have faith in science than in religion is that science admits that it doesn't have all the truth, and indeed has many things wrong. Science says, "Show us where we are wrong, so we can learn, and come closer to knowing the truth." Scientist can, and do ask, "What if Newton was wrong about gravity?" (he was), or "What if atoms aren't really little electrons circling a nucleus, like planets circling the sun?" (they aren't). Finding out that they were wrong about things such as this was the only way to correct their misunderstandings and find the truth. Scientists will even tell you that their understanding of evolution is not entirely correct or complete, and is subject to change as more information comes to light. That's why it's called the "theory" of evolution.
Religion, on the other hand, claims to already have the truth, to know the answers, and denies that it can be wrong. You cannot question religion, at least not in the minds of true believers. Religiously speaking, it is nonsense to ask, for example, "What if Jesus wasn't really resurrected?" or "What if Moses was wrong about the creation story?" Asking such things is heresy, and used to even be punishable by death!
Another reason non-believers don't ask God to give them faith to understand, or to show them the truth, is that it makes no sense to do so. Why would you ask someone for the truth if you don't even believe he/she exists? I'm not being flippant here, but suppose that I, like the ancient Greeks, believed that the world, and a supernatural pantheon, was ruled by Zeus. And suppose I suggested that you ask Zeus for faith, so that you could understand the truth, and to know him. You probably wouldn't do it, would you? So why would a non-believer in God ask God for faith or understanding?
You asked a reasonable question, and I have tried to give you a reasonable answer. These are just some of the reasons that non-believers don't just ask God to give them the faith to see the truth. I hope it helps you understand their thinking, and gives you some things to think about too. Best of luck to you in your own personal journey to the truth.