Misrepresent the beliefs of non-christians (preferably with something completely ridiculous -- like expecting a monkey to give birth to a cat.) Explain to your followers that the bible is trustworthy because it says so right there in the bible and they know the bible is trustworthy. Take snippets of what non-christians say to make it look like they hold a position that they do not -- some scientists are so verbose that whole paragraphs could be lifted out of context. When outsiders correctly point out the strawmen, circular reasoning, and quote mining, respectively, insist that that's what they do when presented with "credible evidence for god."
Remember your target. You are not trying to convince outsiders. In fact, if they think critically at all, that would be impossible. You are trying to make outsiders look unreasonably stubborn to your followers.
Use claims like "creation proves a creator." Never admit that the claim that the world is a creation is in dispute.
When an outsider points out an obvious lie, ignore it. Do not even acknowledge he said anything. Your followers will quickly forget.
Claim that people who committed attrocities were not True Christians™. Keep your definition of christian sufficiently vague that you can always exclude someone at convenience.
Tell your followers that they have everything to gain and nothing to lose by believing. Never acknowledge the possibility of a judge other than the christian god. If someone professes deism, pretend that is an endorsement of christianity.
Tell your followers that you need money for your ministry. The donation should flow. Never mention the mansion or the Rolls Royce. [Editor's note: I am speculating on the actual expenses.]