-Removed-Tell three anecdotes, in which the departed is front and centre, that are - in some mixture and combination - touching, funny. thought provoking, and all in all, typical and defining ~ maybe with at least one of the anecdotes involving his/her church, Christian activity or beliefs/principles ~ and simply do not editorialize or attempt to draw any links between the stories or extract conclusions from them. Let your memories of the departed trigger everyone else's.
-Removed-This man's next waking moment will be in the presence of the Lord. he will be full of joy.
I would try to think of ways this man inspired me and others in his life, positive things of course, and how he will be missed.
I would concentrate on his love for his family and friends and how he would like to be remembered.
-Removed-I do not envy you, giving a funeral oration must be one of the most difficult public speeches to give because tone is everything. If you believe in your words your sincerity will shine through. Sincerity makes up even for a poor delivery because your audience will sense it. Use very succinct notes but use them, it should simply include the salient points that you want to make. Leave plenty of room for extemporaneous delivery. Look at individuals in the audience as if you were talking to them on a one to one basis, but don't focus on them too long. Consider your modulation as well. Keep it simple. Wish you well.