How does Christianity gain ADULT converts?

[Reforged]

I have been wondering how religions, in particular Christianity, gain willing adult converts. I don't mean people who were in a hard place (addiction, divorce, depression) and were preyed upon by religious folk claiming the religion and not the counseling, community, and support made them better. I mean adults who converted on their own whim to Christianity.

I think the same kind of brainwashing going on in children can occur in adults by way of missionaries, apologetics, and only being exposed to one source. I have trouble seeing how someone could read anti-apologetic and anti-missionary materiel, scholarly bible studies, and information about other religions and come out a conservative Christian. I suppose there's also atheists who were always unaffiliated with religion or never gave it much thought and could be swung over to a form of theism easily. The same thing goes for theists though.

Sometimes we find ourselves in a weakened psychological state. You know what I mean; someone dies, you breakup from a ten year relationship, you lose your job, your house, basically sometimes life kicks you straight in the jewels.
Thats when you go "Well shit, whos there for me? Whats the point in my existence."
At that point you're religions favoured prey, if you're unlucky enough to be asking that question round a particularly vocal theist they'll jump on that opportunity like a true predator. "GOD! :-D" will basically be the crux of their response. Sometimes they'll be more subtle and ask a few more questions before bringing it up. They might even invite you to a get-together or church. All the people there would be kind and nice but they'd have one thing on their mind; "Well will you look at that... a new member to add to our flock."

In any other state you'd be aware, you'd be thinking and you'd give a damn but you're not in any other state at that point. You're tired and you're not thinking straight and by the time they're done you won't be thinking straight ever again. You would be fully dependent on the concept of God as a band-aid on a gaping wound. The band-aid doesn't heal the wound but it gives them comfort, it makes them feel better and if they concentrate on nothing else then they can forget about when life was complicated and occasionally painful.
They can forget about the person who died, their ten year relationship, their job, their house, the occasionally getting kicked in the jewels. They can forget the good and the bad, they can have someone do the thinking for them and let it all slip away...
and they do.

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Jesus Christ you're dense.

Okay. What's the justification for believing in Christianity?

Literal interaction/Relationship with the Holy Spirit.

That sounds abit dodgy, elaborate.