Strong words...grandeur meaning and for that and more, I say thank you.
What are you missing you ask? Maybe one thing.
The self.
One can not give what one does not possess. Jesus spoke and walked to achieve goals. Some immediate but most overtime. Eternity had a component but like all things, its starts someplace...at some time.
Today's Christians along with their others have little if any self efficacy. Agency belongs to the others...crowds, groups and yes...religions. Religions act to recreate more religion...their preachers' salaries and buildings expending more capital than on good works. Period.
What I suggest you are missing is what the Christianity thing has created. It seeks people and holds them as nouns and not verbs. The people are lost not exclusively [ see culture...secular world] but in large part due to focus on the wrong purpose...and reasons...intentions and critically views and perspectives of the grand teachings...by Jesus and in the Bible. What happened to the moment. This moment. The only time that can count in creating an evolved self respect...awareness....internal strength and dignity...agency in the self.
Only from self efficacy can one give what they have. Empathy begins with self love. Self love is founded in self respect and self forgiveness. The power comes from within...not from the others...or your "Christianity thing". That thing is a vehicle or better stated, the opportunity. Great teachers are not tellers. They are showers offering context and depth that inspires. Not for a grand cause like propagating institutions but for the agency of the self.
Today's Christian like the religion is lost due to orientation and importantly their intentions. That "thing" you alluded to is there...deep inside intentions. There is the truth. The rest... as you say goes to your thought; we're suppose to care about people. Your religion doesn't....for its intentions don't. That is what you are missing along with where are standing when intentions merge with consequence. Regrouping is a start.
Eric