I can see a few problems with your example:

• you were all kids (kids are more credulous)
• there was not much at stake (on the contrary, increased social status for them; kinda cool to be associated with you)
• the whole gig was short-lived (I hope they still don't believe you are an alien)

Now, compare that with the Hebrew apostles, and consider that, even today, to become a "completed Jew" can cut you off from your entire family. Imagine what it would be like in those days.