Atheists, what are the most convincing theist arguments you heard of?

[SteveII]

If by 'most convincing', 'most persuasive' is meant, it's possible to compare, and I find only one. It's rarely used, but the best argument for theism, and the only evidence it's conceivable to present if God is withholding verifiable miracles, is the theist. If theists had a desirable quality unique to themselves that they could display, that would, in my opinion, be the most persuasive thing that they could bring to bear. It wouldn't be effective on skeptics, but it could certainly persuade fence-sitters. It's hard though, and the vast majority can't do it. Maybe if they actually had the divine on their side, they could do better at that. Their lives are the closest things to evidence that they have, it would be something at least, if, say, we really knew Christians by their love the way Jesus is supposed to have said we will.

And that is the reason why millions of adults every year convert to Christianity (not because of the Ontological Argument). I agree heartily with the sentence I highlighted but think there are some to be found and God may place them in your life if that is what is needed to draw you near to him. 

No offence to the Christians (myself included) in this forum, but what is on display here most days does not qualify. To be fair, the environment makes it extremely difficult to be civil and loving all the time. 

Philippians 1:27 Above all, you must live as citizens of heaven, conducting yourselves in a manner worthy of the Good News about Christ. 

1 Peter 3:15 But in your hearts honor Christ the Lord as holy, always being prepared to make a defense to anyone who asks you for a reason for the hope that is in you; yet do it with gentleness and respect,

Matthew 5:16 In the same way, let your light shine before others, so that they may see your good works and give glory to your Father who is in heaven.