Many religious believers have excellent reputations, but there must always be exceptions.
A quite common reason for a poor reputation is hypocrisy. Some religious believers adopt a 'holier-than-thou' attitude and yet it is often the same ones who turn out to have skeletons in the cupboard.
Another common reason for a poor reputation is the tendency of some to preach or to push forward the fact that they are religious. The majority of non-religious people just want to get on with their lives, without having to defend their lack of belief or even pretend to be religious for the sake of peace.
If you're asking about stereotyping and generalising, the answer is chauvinism. In some cases, perhaps also jealousy and a feeling of inferiority.
Insurgent propaganda may portray their enemies as oppressive followers of the dominant religion in the area, labeling them as religious fanatics who oppress non-believers and use religion to justify their actions. This portrayal aims to rally support by framing the conflict as a struggle against religious tyranny and intolerance.
No religion, whatsoever, encourages terrorism. Believers of any religion may have among them those who for any reason, religious or political or social, get involved in terrorism.
Followers of some religions treat non-believers with disdain, and openly wonder why they fail to see the truth. Some seek to aggressively proselytise to the non-believers and show signs of frustration when their apparently straight-forward information is rejected. Other accept the absolute right of non-believers to follow their own religion, or to follow no religion, and treat the non-believers with tolerance and respect. Apart from this, non-believers may be affected by national or state laws that are based on religious beliefs and limit the freedom of non-believers.
A religious issue always depends on the religion. For example Christianity has issues about sinners. The Bahai Faith encourages its believers not to drink. Zoroatrianism has issues about praying to statues.. and so on and so forth.
The "comfort" of a life after death as well as the "comfort" of someone watching over them and keeping them safe has attracted many people to the idea of religion.
Many religious believers find comfort and community within their faith, as it often provides a sense of belonging and support through shared beliefs and practices. Additionally, religion can offer answers to existential questions, providing meaning and purpose in life, especially during challenging times.
Islam.
Believers.
All of them.
Jewish
God is the father of believers and non believers. He is the father of all mankind. The first creation ADAM is the father of mankind.
Working, eating, sleeping, shopping, cooking, enjoying their leisure, doing the housework and praying when their religion requires it - a bit like most other religious believers, really.