A brand new episode, and a brand new element of the Simpson's life to introduce the audience to! The Telltale Head is our first look at the Springfield church, although our first glimpse of Lovejoy is not through this, but through an angry mob depicted at the start of the episode:

This is perhaps an appropriate introduction to the character intended as a representation of the show's attitude towards organised religion. Lovejoy is not a gentle forgiving spiritual leader, but a man ready to punish a child for his transgressions.
Flanders and Lovejoy are used in different ways to represent Christianity within the world of the Simpsons, at least early on. Flanders is a genuine believer, and his kindness is a standard for others to be judged by, he is literally "holier than thou". Lovejoy, however, is a more cynical representation, he is a stand in for religion's place within a community, regardless of whether God himself is actually involved. Many writers from this era would have been brought up to go to church and 'believe', it was simply the done thing.
At his worst, Lovejoy is a conman, interested mostly in raising money from his flock and not even especially knowledgeable about religion, but the show is rarely that cruel about him. For the most part he is simply disinterested, his respected position is mainly just a job to him, as characterised by his monotone voice and intolerance for Ned.
He appears to be somewhat based on Billy Graham, but he is not really given the televangelist position that Graham had, perhaps he lacks the charisma to make this fully work. This comparison was likely a direct way for the writers to subtly comment on a public figure and question mainstream religion in a way that would have been bold in the 1990s.
Despite all this, when Lovejoy is given a moment to truly shine, he comes across positively. It's easy to use him for a small joke about Christianity, but this might not work as the focus for a full episode, so when we see more of his life we see a man genuinely interested in helping (in season 8's "In Marge We Trust" for example.)
He loves ET.
This post is part of my "Every Simpsons Character Ever" series. For a list of my rules in this project, click here.