Most people are troubled. It's called "LIFE"!
The way you deal with life defines you. Unfortunately, it is the plight of most people to struggle through life. That struggle can cause many ways to cope or not cope depending on the person and the situation. One may suffer depression, anxiety, paranoia, elation, euphoria, and any number of feelings. One of the most desired feelings is one of inner peace. This is desired because it is a coping mechanism that is sustainable. How does one obtain it?
The christians will lie to you and tell you through christ and that is as far as it gets. You can ask a multitude of questions hoping for tangible answers but you will never get anything. They will tell you that you need to have a relationship with a person that died over 2000 tears ago if he lived at all. Then they will tell you if you pray your prayers will be answered. Both are total hogwash. There is NO FUCKING EVIDENCE anywhere that ANY FUCKING PRAYER has been answered let alone granted. You may as well rub a fucking lamp. The only difference is that with the one you actually end up with a shiny lamp.
So you don't achieve inner peace from any religion no matter what anyone says or claims

The truth is that "Inner Peace" is a personal decision. You have to decide to just not take everything seriously, to not panic over anything and just deal with things as they come up.
Take an experienced airline pilot or even better a fighter pilot.
He/she is flying along and all sorts of lights and buzzers go off. Do they panic? Do they automatically eject? No, they isolate the problem and deal with it accordingly. They have confidence that they can overcome any emergency. Their confidence gives them the inner peace that they need. Those that can't achieve inner peace don't have confidence in themselves. They are insecure and afraid of failure. So they are afraid that an emergency will arise in the first place.
There are ways to deal with this insecurity but achieving inner peace always starts with deciding to do so.