The phrase "increase faith" is correct and can be used in written English.
It can be used to express the idea that someone's trust in another person, or in a higher power, is becoming stronger. Example: Through prayer, she found her faith increasing and her reliance on God growing stronger.
The Buddha, the Blessed One, rebuked them: "Misguided men, how can you say 'Let us render the words of the Buddha into classical metre?' This will not rouse faith in the faithless or increase faith in the faithful; rather it will keep the faithless without faith and harm some of the faithful".
To increase faith in government, we don't need a constitutional reform.
To test the feasibility of a dissemination strategy to increase faith communities' (FCs) adoption and implementation of a tested dietary intervention.
The delay raised the possibility of a breakdown in the talks, and does little to increase faith in the UN climate process.
To increase faith in customer feedback, two years ago Amazon ceased allowing reviews posted by anyone who had in exchange received a free product sample directly from the supplier.
Improving the regulatory environment of the sector will undoubtedly serve to increase faith in the formal financial system as well as assist in promoting healthy competition and better products for consumers.
Boris V. Gryzlov, United Russia's leader, said high turnout and early returns reflected increasing faith in the party.
This seems to suggest that what looks like increased faith in government is actually faith in Mr Obama.
Weber claimed Britain's difficulties since the Brexit vote had increased faith in the European Union in the rest of Europe.
Lilly extricated himself from that inning without allowing any more runs, then worked through a scoreless fifth, a measure of Torre's increased faith in him.
While I agree with you about our increasing faith in self-rejuvenation, I would stretch your point further: we have almost convinced ourselves that death is optional.
