Sadly this is going to be true even within Christendom. True Christians are going to look like fools to most Christians too.
It already is true within Christendom, which is tragic. Many mainstream churches have given up on the Bible and follow the world, and their membership grows.
Driving through a liberal area recently, numerous churches were plastered with rainbow flags and "Black lives matter" banners. Imagine if those churches went against popular culture and virtue signalling, and just told the truth: "All lives matter to God".
In a nutshell, these 'christian' churches were loudly and proudly proclaiming their support for -
1. A particular skin color when they should be color blind
2. An openly Marxist organization
3. A Marxist organization that calls for the violence, death, and mindless property destruction against innocent people.
They are fools for the world.