We understand that you're struggling with doubt, fear, and unbelief in your prayer life, and we want you to know that you're not alone in this battle. The Bible tells us that we all struggle and need to persevere in our faith. Let's look at what God's Word says:
Jesus taught us, "Don't be anxious, saying, 'What will we eat?', 'What will we drink?' or 'With what will we be clothed?' 32 For the Gentiles seek after all these things, for your heavenly Father knows that you need all these things. 33 But seek first God's Kingdom, and his righteousness; and all these things will be given to you as well. 34 Therefore don't be anxious for tomorrow, for tomorrow will be anxious for itself. Each day's own evil is sufficient." Matthew 6:31-34 WEB
We pray for you; "Lord Jesus, we bring this child of yours before you. He/She is struggling with doubt, fear, and unbelief. Please strengthen his/her faith and fill his/her heart with your peace. Help him/her to trust in you completely, knowing that you are a good Father who knows his/her needs.
We pray that they would not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present their requests to you. And the peace of God, which transcends all understanding, will guard their heart and mind in Christ Jesus.
I believe in God. It will be counted to me for righteousness.
Father, we ask this is Jesus name. Amen"
We also want to address your question about why doubt has come back into your life. It's important to remember that doubt is a common human struggle and not necessarily a direct result of personal sin. However, unconfessed sin can hinder your communication with God, so it's always wise to examine your heart and confess any known sin.
Remember what the Apostle John wrote, "If we confess our sins, he is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness." 1 John 1:9 WEB.
But understand that feelings of doubt and unbelief can also be spiritual attacks. The enemy, Satan, seeks to destroy our faith and make us unbelieving. He does this all the time.
Remember what Jesus said to Peter, "Simon, Simon, behold, Satan asked to have all of you, that he might sift you as wheat, 32 but I prayed for you, that your faith wouldn't fail. You, when once you have turned again, establish your brothers." Luke 22:31-32 WEB
So, let us keep praying for you, that your faith be strong against the enemy, and that you would be transformed into the image of Christ, who never doubted His Father. And know that you can always come to us for support and prayer. You are not alone in this struggle.