In your opinion what causes christians to believe in Jesus

[Sheldon]

Not only is your sample size far to small, the fact that you're happy to publicly generalize from such a particular speaks volumes about your own thought process. Stick to philosophy, because you don't know shit about statistics or demographics or analysis.

It was certainly clear to me that Bel wasn't making any formal statistical inference

Belacqua Wrote:
I remember meeting a Christian couple...I asked them about their theological beliefs and they said they had never thought about it. 

So I suspect this is true of the majority. 

Yeah ok. 

no statistician would treat Bel's suspicion as invalid

Not a one you say, well well, is this from another handy poll, that only you and @Belaqua seem to know about? It was, and is a hasty generalisation fallacy. 

since you know about statistics and analysis, surely you can at tell us what the appropriate sample size should have been?

I am not of course an expert, but I will go out on a limb here, and suggest that an unevidenced anecdote about just two people, is insufficient to leap to "I suspect this is true for the majority of countless billions". 

You can't answer that unless you know how much information we wish to obtain, among other things, which you don't.

Of course we can, just to be clear then, substantially more than an unevidenced anecdote about two people, if you're going to project that onto a majority from a demographic of billions of Christians, that globally are made of over 45k different sects and denominations.

AI to the rescue..

"For a demographic of billions, a good sample size for statistical analysis is generally considered to be between 300 and 1000 participants. While a larger sample size is always preferred for greater accuracy, practical considerations like cost and time often make it necessary to use a smaller sample. The minimum sample size for any meaningful statistical analysis is typically 100, but for populations of billions, a sample size of 1000 is often sufficient."