Pray tell, what other institution teaches morality in our modern society? Answer: Nothing. Open your eyes, e.g. turn on the radio. Outside of Christian, where is there uplifting music? Rap, no way. Rock, no way. Pop? No way, it is advocating excessive sin. Country? Sometimes, but that is because the majority of its listeners are Christian.
Pop TV: What shows are uplifting? Nothing (outside of cartoons/children's programming), because a "good" story has to comprise of sin nowadays (e.g. murder, addiction, lying, greed, cheating, stealing). Conflict is what society deems a "critically acclaimed" show like Breaking Bad or The Wire. And in order to have conflict nowadays you have to have sin.
Open your eyes. Your kids (if you have any) are going to be brainwashed by sin which is pumped through every public channel available. It is inescapable. In order to balance it, Church is necessary and I'm not talking about exclusively Christian. Future generations of kids are becoming more and more negative and it's because their parents never balanced out negativity with wholesome spirituality in their own lives. When we are constantly bombarded with negativity, it will have a cumulative effect to self destruction. We as a society are becoming more addicted to [insert sin here] with no plan to mitigate it until self destruction and rock bottom are hit. For example, porn destroying a marriage until irreparable damage is done. Eating like shit and never exercising until your doctor tells you that you're lucky to survive a heart attack. Drug overdoses. Assaulting someone because it's ok to always "express how you feel".
Once you hit rock bottom, only then are you willing to change. For some of us, that is how God planned their lives. However, being vigilant of sin and avoiding it by balancing it with the pureness of Church is necessary. Notice how much better you feel after going to Church. That feeling isn't going to be found in other institutions in our society, it is the last bastion of morals in our crumbling nothing-is-immoral and everything-is-ok-if-you-feel-that-way society. We cannot even fully blame our kids for their destruction because we partly did it to them via apathy.