Replace churches with a secular alternative, with trained psychologists instead of priests, 1-on-1 brief sessions instead of confession, and mindfulness meditation instead of prayer.

Ensure everyone in the community participates by giving local tax incentives (i.e. cut council tax by X%).

I think people today desperately need a 3rd space, a local community and a sense of belonging, and this will provide both. Ensure that people living locally, with different backgrounds, see each other once a week, which would naturally lead to some communication. The 'priest' will be in a good position to provide pastoral care, be able to help people that are lonely or otherwise struggling. Many would be willing to help struggling people locally, so in many ways it is a coordination problem which this would solve.

I feel like by becoming less religious we have thrown the baby out with the bathwater and lost some very good things along with the bad. It does not have to be that way.