Many teachings of the Church are shared by all Christians. Some are controversial. Take, for instance, purgatory. With all due respect for those who would disagree, I think it’s one of the most consoling teachings.
I often feel exactly what Saint Paul felt when he said (Rom 7:14): “We are well aware that the Law is spiritual: but I am a creature of flesh and blood, sold as a slave to sin. I do not understand my own behaviour; I do not act as I mean to, but I do things that I hate.”