I respect your opinion, I'm also Catholic, I don't make fun of the church or the confession, I just thought it was a good idea to show spiky in this way. Confession is the excuse to introduce the subject of the secret, to show spiky trying on Pinky's dress, and that in what he does, he feels guilty (reason for what is secret). The last part where the bulldog chases spiky if it's a satire, profess love with words, but don't apply it to reality.
I like to think that cartoons are a form of free expression, sorry if it's offensive, but that's how I thought about it :)