Being convinced of something usually makes one unwilling to change their mind. It is, or becomes, "their" "opinion", but what it actually is, if they are easy to influence and for some brought-up among similar things, is brainwashing which buries so deeply, and the person becomes uncomfortable or defensive to opposition or challenge. Take christians - they are, or soon become, convinced of all of that christian nonsense; this is contrary to the truth. Atheists and Spiritual Satanists know that christianity is a lie.
For christians - especially the hardcore and fundamental ones - it is repeated repeatedly, and this strengthens the conviction. For atheists, they - and Spiritual Satanists, we - brush it off and ignore it and get on with our lives. As christians are more or less commanded to "bear their own cross", they carry burdens upon themselves which weigh them down and blame Satan for it, and call "god"* "good"; christians literally are living their own christian-hell. The deeper they go the stronger it becomes and more difficult or impossible to escape from, and they think Satan is the baddie.
Consider the roots of a tree. If one is travelling along the road of life, and they are in an accident, one piece of advice that anyone can give is "If you're going to hit anything, don't hit a tree"; the roots will not let the tree be removed. They bury so deeply and spread widely and grip the fertile Mind and Soul of the christian. This "tree of life" is poison - look what happened to "adam and eve"; they ate of the "tree of knowledge of good and evil" and then "sin entered the World" and people died. "god" planted a poison apple** tree. The roots of the poison tree of christianity bury and grip and are relentless, and the poison from the tree of christianity kills the christian - and in history if not today, kills non-believers.
The conviction that the christian has is so much more powerful and damning for - rather, against - the christian than it is against atheists and Spiritual Satanists. Convictions grip one very, very tightly, and don't let go. It is a form of Karma - the direction they are going in life, building-up all of that momentum behind them like a cargo lorry or freight train, the momentum carries them into that way, that direction in life, and it becomes increasingly difficult or impossible to slow down or change. When applying the brakes, we understand friction and heat happens, and that causes problems for people, especially if they are 'backsliding' from christianity - it is not always an easy process, but (the metaphor is being stretched here) if it is possible that the lorry/train is stopped, then the brakes and tires/wheels can be repaired or replaced and the lorry or freight train can go elsewhere, turning over a new leaf, having a different life.
*"jehova", in its original hebrew, means "god of evil"
**as depicted