Given how long a searched and how many religions and supernatural claims I have looked into, that is not true for me. I did not become an atheist overnight. I became an atheist over the decades.
Honestly, if there is one thing that would make me think there was a God, it is if that entity corrected their followers when they get things wrong. Not staying I would worship them, but then there would be some consistency and measurable behavior.
I think this states a lot of why many are atheists as "Christians" go on and on claiming this and that while their lives don't add up. A lot of atheists are so because they got fed up with hypocrisy of so called Christians when they were trying to get a handle on what truly Christianity is about. In other words if the proof God exists is in the lives and actions of his followers then having poor examples of them is akin to looking for a reason to believe in gravity when everyone trying to prove it only wants to do so while they are in a spacesuit on the space station.
I've not been an atheist but from being a Christian in childhood I backslid due to things Christians do and say not lining up with who God truly is turned me off about Jesus. A sort of "gravity" type example would be I was born and grew up some on earth then was thrust into outer space and over time having weak to no gravity I lost focus and thinking I would never be on a large enough planet to experience gravity I gave up on believing in it.
All in all for many people it is not about intellectualism that wins them to God but the lives and love from his people that are compelling to them.
I am no great example of a Christian as I tend to be more intellectual than emotional and loving but I realize that
honesty and humility often is respected by those who are looking for truth, personally I would rather listen to a simpleton speak of simple things that loves and helps people than an arrogant intellectual that is a hypocrite. I may not garner any earth shattering knowledge but my self desire to be less arrogant and hypocritical and more caring and useful to God in it all.
As I think others have said about Ghandi.... I love your Christ but don't like your Christians. It is often hard to want to be what Jesus wants us to be when everyone else who claims to do so.... don't. I've heard some refuse to call themselves Christian because too many who do... aren't in their actions, I call myself Christian not because of my deeds and actions but because of my failing in being an example I point to Christ as the example.... not myself.
I think many atheists if they truly felt the love of God overwhelm them it would be enough, sadly too often they feel Christians despise them instead for their seemingly defiant attitude.
I've since decided that those who accept Jesus but don't want to call themselves Christian in reality either are hypocrites themselves or could be better examples of Christ and instead stepping up to show people what a Christian should be.. an example to those seeking, they cop out due to ego.
I'm a lousy Christian myself, even though I believe my knowledge of Christianity may be a lot better than most, I fall way short on loving others and it is a personal defect of mine that I will always struggle with. It is the struggle of all mankind to both find himself and come to grips with where God stands in his life and who he truly thinks God is what others say and act like God is... or what they decide about him. I think often one believes or disbelieves in God due to their own faulty information and biases and premises and in their confusion look for an example and only see infallible corrupt Christians and give up on it.
The Bible says "my people perish for lack of knowledge" and I backslid in my younger life due to lack of knowledge, I have faith now and will always believe because of knowledge but struggle with the part that knowledge has no answer for... love.
No amount of science can truly explain love, it is a quantity that exists in people that love and are loved and because of our corruption of sin and sin in others it is often nearly impossible to feel/see the love of God in
others lives when they don't love us. Those seeking God can only get there truly if they do plug love into their search pattern and if they don't find it from fellow believers in God (Christians) then they often give up on God but I believe many are hoping to find that love that is claimed to exist by Christians but aren't holding their breath.
I do wish that honest atheists would consider that their struggles ending up with them giving up on believing also in the struggles of those who do come to faith in God similarly. Some of us Christians don't get zotted by the Holy Spirit splatted our backs in a sort of euphoric trance of love and power we just sort of feel better and can't explain it but even when we do have God work in our lives often we take it for granted when he doesn't work we get disillusioned and fall away. I often have respect for people who don't want to be wishy washy and not sit on or hop back and forth over fences about God that just either says God or NOT God (atheism).
I think a lot of atheists don't want to be hypocrites but personally I think that hypocrisy isn't a Christian thing but rather a human thing that must be fought against equally by all and that Christians often figure because they are forgiven of sins if they are a hypocrite it isn't a big deal to God.. sadly though it is as Jesus himself made very strong statements about it in the Bible itself... He was MOST upset about hypocrisy so if dealing with hypocrisy is a reason for rejecting God then the only thing I can say is Jesus is on your side in rejecting it.