How Can I Keep from Looking Legalistic on Social Media?

Questions about how to respond to someone who doesn’t see how Jesus could be God, who wants every question answered before believing Christianity is true, and how to keep from looking legalistic when sharing one’s faith on social media.

• How would you respond to someone who doesn’t see how Jesus could be God and wants every question answered before he can fully commit to believing Christianity is true?
• As I share my faith on Instagram, how can I respond to claims that standing on biblical truth amounts to legalism and also guard myself from real legalism?