I have been discussing this issue with Christians for a long time and the reasons and "evidence" that are given for their faith are broadly as follows:
What it says in the Bible (in various degrees of literalism)
That Jesus existed as a man and Christianity could not have grown the way it did if he didn't rise from the dead
Most people in history have believed in some god or another. Are they all wrong?
Nothing can come from nothing - something caused the universe and we call that something God
Science can't explain everything
Science and religion answer different questions
Person X was riddled with tumours that suddenly disappeared after they were prayed over. The doctors were all stumped
Faith is a gift from God. If you had it, you would understand
Human morality makes no sense without God or some greater purpose. If we're just biological creatures and there's nothing after death, what's the point of being good? What's to stop us all from running out raping and murdering each other?
Religion is good for society
Religion makes people happy and gives them hope
The Watchmaker analogy (beloved of creationists, but still often used by more sensible Christians)
Earth is perfect for us & provides all we need. That can't be coincidence.
God always answers prayers - his answer is either yes, no, maybe
Einstein/Newton believed in God
I had an experience that simply cant be explained. I don't expect anyone else to believe me - but I know it was God
You can't prove God doesn't exist
and, for good measure because I see/hear it ALL the time......
Shakespeare said: "There are more things, Horatio.........."
Now I'm not saying that all believers on this thread have used these arguments, so I'm not putting words in peoples mouths. But I would be amazed if the "evidence" people think they have for God doesn't fall somewhere into these categories.
Me, and every other atheist here, can show beyond any sensible doubt that not one of these arguments provides the slightest, tiniest shred of evidence for any God, let alone the Christian one.
When we say there's no evidence, that's what we mean. There truly isn't.