Then Philip opened his mouth, and beginning at this Scripture, preached Jesus to him. NKJVWe do not preach Heaven and Hell, peace, grace or even 'the Bible'.
We preach Jesus, and we preach Him personally to people, whether we preach to an individual or a crowd.
There are different manners of course, such as through preachings of peace in Him or stories of the Bible; but they all should come back to, fundamentally, "preaching Jesus to people".
I don't want to forget that I am not giving an argument for belief in that which is often not known tangibly, dragging someone into eternal joy (and away from the alternative) or convincing others to switch religious teams; I am inviting people to a relationship with Christ to be their King and the Father who made them under the guidance of His Spirit.
Now to Him who is able to keep you from stumbling,
And to present you faultless
Before the presence of His glory with exceeding joy,
To God our Savior,
Who alone is wise,
Be glory and majesty,
Dominion and power,
Both now and forever.