Install social plugin that has it's own SHORTCODE and add it to Theme Options - Socials - 'Login via Social network' field. We recommend: Wordpress Social Login
Hebrews 11:6 New King James Version (NKJV)
6 But without faith it is impossible to please Him, for he who comes to God must believe that He is, and that He is a rewarder of those who diligently seek Him.