Much like gender theory, Christianity will ultimately fail because it provides no objective mechanism whereby its adherents can work through their disagreements. Its myriad contradictions can make it appealing to everyone, but it can't provide one unified vision that all those people can agree on. In this thread, we have Christians arguing that the exact same action is both commendable and worthy of eternal damnation. Small wonder that those who seek concrete truth these days try to find it elsewhere.
I will feel no obligation to take Christianity seriously until Christians can actually agree on what it is.
The idea that a religion/ideology ought to be unified on every single issue before you take the beliefs of any follower of it seriously would force you to reject virtually every ideology.
If an ideology lays claim to being "The One Truth," then yes, I will expect its followers to be unified with regards to what that truth is. This does not apply, however, to other ideologies that don't make such grandiose and self-important claims.