Don't look down on anyone. We all make mistakes and you shouldn't judge them by what they have done. You also shouldn't look down on people who come from different backgrounds from you. We all have different lives but we're all equal. It doesn't matter how long you've been Christian or how many good things you've done. We are all in the same boat and we have no right to judge each other especially when you don't know the other person very well. God loves all of us equally regardless of our background or our good deeds. Nothing could make God love you any more or less than He already does. We should try to mirror God's love for everyone. We were created in God's image so that means we should try to do things the way God does which includes loving everything equally. Of course you will fall short if God is your standard but He will always forgive you for sinning when you repent. Do your best to live the way Jesus does because He lives a life with full of love  and justice which we should all try to mirror.