If we wanted to call it a "problem with religion", it could be about its normative and critical nature. On one hand they talk about "God's unconditional love", and then it somehow means norms, norms, norms, which simply doesn't mean love, love, love.
We can't love someone without accepting that person and allowing him to be himself. The moment we start imposing our rules, our truth, our norms, we are invading his mind's space, we are intruding, we are permitting-and-forbidding - which means LIMITING that person by erecting boundaries to his freedoms to be, think, feel, and expand, which is the basic and dignified right of every human being.
I never question a person "why he chose a certain religion", because it's simply none of my business. But such a person WILL feel called upon to question MY beliefs. What makes him so "divine", he is just another dude who can cite some passages from a book. I have met many of them on my 70 year long path, and when they didn't talk about their religion, they were gossiping, complaining, cursing, playing victims, with a full blast of a dark neurotic passion. Where was that faith, that love, that harmony, that forgiveness that they were preaching about? Whom are they really kidding?
I simply don't feel like sharing my sense of divine with someone who compensates their insecurities by hiding behind something big. Like they automatically become qualified to explain divinity by reading about it. And again, I don't mind their believing whatever they choose; as long as they don't try to impose it on me and question my beliefs.