The best and true altar you can build for the Lord is your life. He is not interested in any other. God desires to dwell in your life. So, the quality of your life should attract people to God. Your speech, your conduct, the way you dress, your relationship with other people should make people to recognise whom you serve.
“That is why we said, ’Let us get ready and build an altar —but not for burnt offerings or sacrifices.’ (Joshua 22:26 NIV)
Every genuine child of God is a mobile altar of the Lord; a carrier of God’s presence. And, the more you seek to worship God in spirit and in truth, the more your life would reflect His glory.