Op, I think it can seem like it, partly through eg your experience at university and thereafter, partly the way the church is portrayed in the media, vicar of dibley, anyone, partly that the cofe used to be described as the Tory party at prayer, back in the days when.
But that ignores, as others have said
Wealth dies not protect you from tragedy. Think of that poor family where the mother has been charged with murder of her three smallest. I have no idea whether they profess any religion, but the point is that an apparently materially well off position is not necessarily happy making.
That there are a lot of v comfy atheists around. And with no imperative to give alms to the poor, they could well be comfier !
The Pentecostal churches are growing hugely. Many of their people are the reverse of comfortable.
The work of the London City Mission is with the poor and outcast, in particular.
The RC church has supported the cause if the poor in this country since Manning and Wiseman.
Justin Welby has been mentioned; he has declared concern about usury, especially affecting the poor.
And, anecdotally, I can tell you that the social profile of the congregation of the church I go to has altered a lot over the last few years. Fewer wealthy people, more multi ethnic people mostly English but some recent immigrants.
I would not presume to judge the individual state if any body's spirituality.
Finally, on faith. I think it can be a bit like falling in love and then going into a partnership. You have the first uprush followed by the honeymoon period.
It's then a slog for many people to keep going. If you expect that uprush of feeling constantly, you are almost bouind to be disappointed. You have to accept doubt as part of it, probably, and just continue, using the disciplines you have built up during the first rush of emotion.
Some people are very fortunate and have that inner conviction and joy all their lives.
Many don't.
The two best descriptions of those who don't imv come from writers who might not have had very much to say to each other, CSLewis in The Screwtape Letters, and St Therese of Lisieux.
I find it like an onion, many layered. I have layers if doubt layers of belief. They are often at war. And I go through phases too. I don't think it is unusual.