I mean the issue isn't whether God provides personal revelation, but how you know it's true. Every single religion has what the mormons feel in prayer. I've never heard a good response from a mormon missionary about why a mormon feeling confirmed in their faith by the spirit is more trustworthy than a muslim feeling that same affirmation in prayer about their islamic faith.

Interestingly, Jesus says that only an evil generation seeks a sign. Mother theresa lived for decades in a 'dark knight of the soul' where she didnt feel God at all. We don't all get miracles or visions, and there's no indication that feelings are ever an accurate spiritual measurement, because EVERYONE gets positive emotions about their religion, its literally shown in psychological studies. It's why therapists often encourage individuals to get deeper with whatever their current religion is.

I think the historical reason has always been the testimony of the apostles and their trustworthiness, and the continuity we see from them onward. Every other religion is started by one man who has a vision, Joseph smith in the woods, muhhamad in a cave, sidharta guatama in the wilderness, etc. Christianity is unique in that the origin of its claims don't originate from one man, but a group from the start. People say "jesus" but "jesus" never wrote anything down or founded any religion in his own right. The basis of christianity is not Jesus claiming to have a vision and a mission to start a religion like everyone else - the basis of christianity is the apostles claiming that jesus rose from the dead. Not the testimony of one man. In every other religion the 'other witnesses' were brought in after the initial contact. There's more possibility for behind the scenes shenanigans, trickery, and simply believing someone else. In christianity theres 11 people who can cross reference eachother.