you can't make your husband a christian, nobody can, it is from him and with God.
God allows us to come to the understanding of his mercy and through JesusChrist we became save, so through his mercy God allows your husband with time an opportunity to come to that understanding, it is up to him, though you can give good testimony of God in your life, and always trust in his promises of salvation. keep praying and wait. in God's time all of his will, will come true. blessings.