I would suggest reading the parable of the widow’s mote.

It’s not my duty to solve the Christian’s problem. Their book teaches that love is sacrifice and that they recruit in love. If this one doesn’t know how to sacrifice for another because they’re online then their own text suggests they find another way to recruit.

If the one found a way to love the other, if they’re true to their faith, then we will likely never know.

You came to proselytize. They asked if you love them. Now, show this person a meaningful sacrifice.