my brother if you have accepted Jesus in your life and have repented you are saved just be obedient to the word of the Lord I have gone through this a lot where I doubted in my salvation but the Lord just taught me how to clean my life from the world it is a progress. brother there is a time where we think bad thoughts of God but it is not us who think this always it is the devil sending thoughts to close our relationship from God.. brother just stand firm in the word of God, Jesus loves you a lot and he hasn't left you he is with you and will help you just allow him to help you! remember Jesus says “These things I have spoken to you, so that in Me you may have peace. In the world you have tribulation, but take courage; I have overcome the world.” John 16:33 Praise be God's in Jesus name amen!!