Right Truth, I notice, that in your title you did not ask how to show that Christianity is the superior "religion". I understand this could have been intentional, and because you do not consider Christianity to be a religion. But, the Bible does say >
"Pure and undefiled religion before God and the Father is this: to visit orphans and widows in their trouble, and to keep oneself unspotted from the world." (James 1:27)
God proves the Christianity which He knows is superior. He does with us all that He knows He means by His word > Isaiah 55:11, 1 John 4:17.
I find that the Bible presents God as being personal with each of His children (Hebrews 12:4-11, Isaiah 58:11, Colossians 3:15, Romans 5:5), and in the scriptures we have how we need to totally depend on Him (2 Corinthians 3:5, Colossians 1:29), all the time, to personally correct us (Hebrews 12:4-11, Galatians 4:19, 1 John 4:17) and personally guide us (Proverbs 3:5-6, Colossians 3:15), more and more all the time as we mature and grow as His children. I don't see this obviously emphasized by any non-Christian group or by some number of groups claiming to be Christian.
I think this is superior, how our Heavenly Father through His Son Jesus is so personal and about family with us who are His children, and He has us reaching to enemies in order to adopt them to join us. I don't know of any other group who believes in such family sharing with God and being all-loving with interest in adopting any evil person, at all, to join us, having hope for how God is easily able to change any evil person into a child of His love. Jesus on the cross died with hope for any evil person, at all, to be reconciled to God and become a child of God.
To me, it is clear that God is about family loving. Even while Jesus was on the cross, He was taking care of His mother, for example > John 19:26-27. And God's Person's include the Ones called "Father" and "Son" . . . not the Bank President and Bank Manager, or the General and the Captain, or the Mansion Owner and Gardener. And man in God's image is a family being, of three basic family persons . . . father, child, mother
And God has the best standard > not only things He tells us to get ourselves to do, but how His love cures us to have the character of His own love > 1 Corinthians 13, 1 John 4:17, 1 Peter 3:4 > Romans 8:29.
I do not know of any group besides Christianity which presents God to be about this, and emphasizes these features which are right in the Bible.