The word 'preaching' is correct and usable in written English.
It is usually used to refer to an attempt to convince or persuade others to follow a certain course of action. Example sentence: The preacher was preaching to the congregation about the importance of forgiveness.
A government preaching fiscal discipline should not be letting £200m slip between the cracks.
Gillespie pays tribute to the success of 10 10 in "reaching out, and not just preaching to the converted".
Tracks like All About That Bass, Shake It Off, Habits (Stay High) and Turn Down for What aren't preaching acceptability; they're encouraging individuality, whether that's through respecting your body, dismissing criticism or getting really drunk.
The current pope is preaching doctrine denied by Pius X.
In fact, the only people telling these young men why their lives were as they are were these radical Islamists preaching in jeans and T-shirts.
He's in Atlanta, the birthplace of the Southern Christian Leadership Conference, in the 50's and 60's – Martin Luther King was preaching at Atlanta's Ebenzer Baptist Church on Sundays until 1968 – formative years for the civil rights movement and anyone born in 1945!
Radicalised imams have in the past been preaching a message of hate".
Northern Ireland's Tories, including a number of Catholics prominent in the worlds of business, media and charity, were initially enthused by Cameron's promise to stand candidates in each of the 18 constituencies preaching a message of religion-free, non-sectarian, pro-union politics.
My hunch is that the Express and Star audiences are prime Ukip territory, so urging them to vote for the party is like preaching to the converted.
Pacific customs mixed with religions such as Christianity can often be exclusionary, despite preaching tolerance and respect as core values.
In the South, Sinn Fein is the fastest growing party, and is preaching a socialist populism to those left behind by the Celtic Tiger, in marked contrast to the neo-liberal consensus adopted by their rivals.
