Right diagnosis of symptoms, wrong diagnosis of malady. It's not that "Christians" don't believe and didn't live up to what they should have done during Covid--many did, especially those on the front lines who risked their lives to the sick in the very beginning, when no one knew how deadly the virus was, and many whose voices were silenced when it became apparent the lockdowns and "mitigations" were stupid and that people were being lied to) it's that:

1) Many people who claim to be Christian actually believe other things more than they believe in God

2) Fear will make many, many people abandon what they do believe and hate themselves for doing it

3) Many people in charge care only about their own power

4) Those things have ALWAYS been true, and only a sincere and strong Church that teaches otherwise can make people overcome those things to behave otherwise. It's easier to kill or enslave enemies than forgive them, easier to let the poor die than bother to feed and house them, easier to let the sick die than to cure them--and that's what people do, and always have done. The less influence Christianity has over thought and institutions and political leaders, the less you will see any of those things happen.