Every sane theist has doubts. And there is no deniability needed because doubt is reasonable and acceptable. It's part of the human condition as there is so much that we cant know. Faith either works for us or it doesn't. And we all engage in acts of faith all the time because we don't have sufficient knowledge to justify our chosen actions, otherwise.
I acknowledge that reliogious belief is a common human behavior that is both biological and learned. This makes the believer trapped in the circumstance of their evolved state of being, their societal norms, and the ability to reason objectively. Reasoning tends to be what is set aside since it is a skill that has to be taught and acquired by the person. Most can get away with unskilled thinking so long a they stay within the societal norms. Not everyone has to think for themslves. Religion and politics are two areas that do require a person be able to think for themselves since both are highly dogmatic and appeal to identity and belief.
The amount of doubt is related to how well a person can reason. How many believers are exposed to criticisms? How many actually subjected their religioius belief to criticisms themselves? Again, we go back to the biological and societal elelments of belief.
Yes, you can tell yourself that be cause it is possible. It is that possibility that opens the door to faith. And it is through that faith that you can find meaning and healing in that child's death. Something you could not have otherwise been able to do.
And how often does God come through and perfom a miracle? If you say it happens, even on rare occassions, that begs a follow up question as to why just those few miracles and not for all the little kids who struggle for life despite doctor's efforts to save them? Of course people in the West think there's a possibility for a miracle, that's how they are taught to think and believe. In the East people suffer loss as well, but they are taught that life is a cycle, and death comes as part of the natural order. Those in the West are promised everlasting life, and this creates a sort of greed for life. I suspect the reason Westerners still want a miracle and don't ask God to help loved ones dies faster and into heaven, is because they really don't buy into the afterlife.
I personally like the idea of an afterlife and wish it was a thing, but that impulse makes any loss I have suffered worse because I am holding on to some illusion that is unlikley. It's better to accept death as a permanent state of nature.
Everything that matters to us tales effort.
I find the effort to maintain illusions something that offers no benefit in the long run. Looking at some of the members on RF who believe the afterlife is what is important and this life is to be dedicated to faith suggests an absurdity to me. But I can see how religious faith as a sort of hobby, something that occupies the interest of some folks. Collecting shells on beaches isn't anything I'd want to do, but I'm sure there are people that do. I have been racing bikes for 40 years, and that takes a lot of time training. Some suggest I retire but it keeps me fit and most of my friends are athletes. The difference between hobby activities and religion is that religion requires belief in ideas that don't correspond to reality. Collecting shells does. Racing bikes does. Baking does. Yoga does. Religion is unique in that it requires a mental framework that is illusory and highly assumptive. Does all the work (including denial) work as a benefit to the religious? Look at creationists. Look at evangelicals who support Trump. These examples are real due to the bad habits of religious thinking.
Not nearly as exhausting as it must be to keep negating it for no reason, or gain, at all.
Quite the contrary. I do my hit and run debates, and I turn off the computer and go about my day without having a huge set of non-rational assumptions hanging over my head. Atheists have less baggage. Look at some of our member Baha'i have had their minor emotional outbursts and breakdowns as they try to convert skeptics. And they learn nothing. In psychology there are theories that explian the attraction to self-abuse and pain. This includes the satisfaction of spicy foods and endurance sports, but also people who are attracted to abusive relationships. These aren't the same phenomenon, but it illutrates that humans can open themselves to pain as a way to experience life, and some are not destructive and some are. It is apparent that some religions are not healthy for believers, and they are in some way like a toxic relationship. It's learning about what we subject ourselves to in forms of pain that alow us growth and maturity, emotional intelligence.