With science you can figure out how to do all of this. The human brain can be incredibly predictable. You just need to know what to look for.
But I don't know what you mean by "support the human heart."
What insecurities are you referring to exactly?
Science can provide inspiration. But different people find different things inspiring. Some find the concept of eternal happiness inspiring. Others find the concept of this being our only chance at happiness inspiring. In the face of inevitable suffering and death, it depends.
Science is a tool for understanding nature. Who will react a certain way. What an object is made of. When things will happen. Where things will happen. Why certain events occur. How things work.
I believe science can address anything. It has shown to explain more and more, with no conceivable limits.
You are dismissing a hugely important aspect of why people believe in god. You are also attempting to put science in the position of providing solace and inspiration and encouragement, which to be honest I think is simply silly.
I am not saying that any of my remarks are a 'proof' of god's existence by the way. Nor am I belittling science. What I am doing is criticising the notion that science can take the place of religious faith in peoples inner lives.
Right now there are around 7 billion humans on this planet. Hundreds of millions of those people wake up every day to horror. Starvation, homelessnes, disease, war; watching their children growing up in misery if they grow up at all. It is easy from the perspective of middle-class members of wealthy societies to forget or just ignore that.
Tell me, what is science offering those hundreds of millions (billions ?) of people for whom life is hellish ?
"The pleasure centre in the brain" ? Psychology ?
FYI - Recent research established an important fact about psychology - You are no doubt aware that when natural disasters or terrible accidents or mass murders occur, teams of psychologists are often sent in to counsel the survivors. Studies have been done to determine the outcomes of counselling vs no counselling, and it turns out that those who receive no counselling generally show better recovery from trauma than those who receive counselling.So much for psychology.
I read a very enlightening book by Peter Lomas called 'Cultivating Intuition'. It is about the bureaurocratisation of psychological counselling in the UK (and elsewhere). Lomas is a psychologist, and has observed the intrusion of government into the process of providing psychological counselling. He (and various professionals I have spoken too) argues that the attempt to systematise and standardise the delivery of counselling services has severely degraded those services. His observation is that it is not the mode of therapy which actually matters, it is in fact the quality of relationship between the counsellor and the client which is the determining factor.
In other words a caring parish priest is likely to be much more beneficial to a human in crisis than a university psychology major, unless that psychologist has innate interpersonal skills which transcend the McTherapy taught in institutions.
Science has no handle on poetry or the subtleties of human feeling. Machines cannot provide grief counselling. Psychologists cannot be trained to engender courage in the human heart. They may write theses which claim they do or can, but the real-world results do not back up such claims.
I should add that I personally do not think that religion is the only way to deal with human suffering either. It does come down to the quality and depth of human relationship.
But to suggest that science is or will be the answer to all the sufferings of the human condition is simply zealotry with nothing to back it up.
You asked "what insecurities exactly ?" . Well, lots. Read poetry and good novels to gain some insight (because you won't find any science with much to say about this). Or go on a journey of discovery - go to a soup kitchen and talk with people who have been psychically disabled by crisis for example. Explore the anatomy of the human heart. Talk with survivors of war, or with women suffering post-partum depression, or with artists who are compelled to express the inexpressible.
The human heart is not a simple logical device like your laptop. You can't just reboot it or update its operating system.
There is no evidence that science can nurture or heal the human heart. Science deserves great respect, but when you assert that it can deal with every aspect of human existence, and that there is no kind of question it can't answer, then you are moving into the realms of fundamentalism.
And statements like 'maybe not yet, but eventually science will explain everything' are statements of belief, not science.