We understand your concern and we will pray for you. Thank you for including Jesus Christ as the center of your request. This is the only way to the Father and the only way to be saved.
Firstly, let us address the spiritual blindness of your husband. It is indeed a challenging situation when a spouse is not saved, and we will pray and encourage you to be godly in your relationship. God may be using you as a light in your husband's life, and in the lives of your stepchildren. As it is written in 1 Corinthians 7:13-16 WEB:
"If any brother has an unbelieving wife, and she is content to live with him, let him not leave her. The unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband. Otherwise your children would be unclean, but now they are holy. Yet if the unbeliever departs, let there be separation. The brother or the sister is not under bondage in such cases, but God has called us in peace. For how do you know, wife, whether you will save your husband? Or how do you know, husband, whether you will save your wife?"
We must also address the situation with your stepchildren. It is important to remember that God calls us to love and forgive, even when it is difficult. The Lord says, "But I tell you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who mistreat you and persecute you." (Matthew 5:44) However, it is very wrong to manipulate or attempt to take advantage of any relationship and we can be honest to God about how we feel. This being said, it is only through the love of Christ and by the power of the Holy Spirit that such forgiveness and love is possible. Provide us the opportunity to pray for this situation. We will also pray for your husband's salvation and for the Lord to open his eyes to the truth and remove the spiritual blindness and deafness.
Let us pray:
Heavenly Father, we come before You in the name of Jesus Christ, lifting up our sister who is in need of Your guidance and intervention. Lord, You see the strife and division that her stepchildren are causing in her marriage, and we ask that You protect her and her husband from any harm or manipulation and remove the greedy spirit that is manifesting. Open her husband's eyes and ears that he may see and hear what is truly happening and respond in a way that honors You, Lord.
We pray for his salvation, Lord. We ask that You soften his heart and open his spiritual eyes that he may see the truth of the Gospel and accept Jesus Christ as his Lord and Savior. We pray that he will have a heart full of generosity, not only to his children, but to others and his wife. We pray that he will be a godly husband and father, always seeking to honor You in all his decisions.
Lord, we also pray for our sister. Give her the wisdom and discernment she needs to handle this situation in a way that brings glory to Your name and peace to her and her husband. Help her to be a light in her husband's life and in the lives of her stepchildren, that they may see Your love reflected in her actions.
Remind her, Lord, that You are her inheritance and her provider. Help her to trust in You completely, knowing that You will supply all her needs according to Your riches in glory.
In Jesus Christ name we pray.
Finally, we encourage you to continue to seek the Lord's will in all things. Trust in Him, and He will direct your paths. Be strong in your faith, knowing that the Lord is your inheritance, and your provider and He will never leave you nor forsake you, and that He is a husband to the widow and a father to the fatherless.
Prayer Focus: God, Thank You. Thank You for loving me. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, mind, soul, body, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
