What doesn't makes sense to you in the Bible, you are not expected (by God) to live it out. God expects us to live our life depending on as much "
light" God has given to us so far just like a Mother does not expect much from her helpless baby or young kids. She goes on feeding them, working for them and helping them until they are strong enough to be on their own. Even after her children become adults, she still does not neglect them but advises, works and would lovingly take care of her children's children too. So, God is and does the same too.
Faith generally develops over a period of time to every christian. Sometimes suddenly we get a strong faith as if from nowhere. Right from the time i experienced being born-again and till now (12 years approx.) i have been asking God to increase my faith and He did although in my initially i was not knowing anything about faith.
The Bible says "
But as many as received him, to them gave he power to become the sons and daughters of God, even to them that believe on his name". So, if you believe that Lord Jesus Christ is indeed God come in human bodily form as a sinless sacrifice for your sins and for the sins of mankind and through Him alone we have salvation, then, you become a child of God. This is the starting point i.e. of believing this Spiritual Truth. And from there you start into becoming a christian.
Next, we in obedience to the Word of God, repent and confess of our known sins so far committed and seek forgiveness from God in prayer and ask Him to cleanse our hearts through His precious sinless blood. And then, we no longer have the desire to live as we want to, but choose to live as God wants us to live, knowing and understanding that God's designed life for our lives is the best and perfect life for us.
Even though i was a born-christian like you, i had to know Christ personally before i could become a born-again christian. Even though my family members believed in Christ and were Christians, even though i attended church along with them right from my childhood and even attended Sunday School as a kid, i still had to "
know" Christ in a very very personal and intimate way. And that happened during my late teens and early twenties and from then on i went on to know Him more and more. There have been many times all these 12 years approx. when i faltered and could not keep those do's and don'ts in the New Testament or the Old Testament and found God to be excessively patient and merciful towards me. He allowed me to grow at my own pace although other christians were having different opinions about me.
I continually asked God to increase my desire and my love for Him in my personal prayers as i always thought that my desire or my love for Him was neither sufficient nor equal to the love with which He loved me and gave His life for me on the cross for my sins and because of Him alone i can now hope for salvation and eternal life. And God did increase my desire and my love for Him over the years. Even now, after all the ups and downs, i still can sense an intense desire and burning love springing up from within me. To me God turned out to be the one who always overwhelmed me with His love and blessings so much that it made me shed grateful tears during my quiet time with Him. I strongly believe, this is how much loving, merciful, long-suffering and patient our Lord and God is with every human being who believes and trusts in Him.
I started to read the Bible a little now and then during my initial months but i became a more serious Bible-student when a bro-in-christ of mine, who also came closer to God during those times and, started asking questions for which i was not able to answer much. Then, i realized how much equipped i really must be to answer questions regarding my faith using Scriptural verses. I should say i am grateful to that bro-in-christ for triggering me into such a direction although God was the source but still he was the instrument.
So, i have not become a christian just because i was born-and-brought-up in a christian family but because i came to know Christ in a personal way and by following consciously what the Bible commanded to as much "light" God had given me. so, my faith is not based on my family members although i should confess that they were praying for me regularly for my salvation and spiritual growth. My faith is directly based on Christ.
In all these 12 years, there were a lot of questions which popped upto me now and then and i searched and read the Bible, looked at books written by born-again Godly Men and Women for the answers. I was pretty strict with myself and was choosy about the christian books that i read. I wouldn't read any book without knowing a little about the Christian life of the Author. If his/her christian life impressed me then i would attempt to read his/her books or magazines. All my questions were not answered in one book or devotional. I had to discuss with my bros-in-christ also to get some practical answers. But, i was always hungry to get my questions answered and was patient enough to get the clear answers for them finally. For some questions, i had to wait for a few years before i got the answers. I still have many questions and i know that it would take time before i got the answers for them. For God is infinite and man is finite and it takes millions of years to understand the infinite God for a finite man like me. I also read that we still have to continue living the christian life faithfully although we don't get answers to some questions.
Most of the answers can be found in the Bible, and although they are 2000 years, we need to attempt in following them to as much extent possible with us because we need to think practically too.
The Holy Spirit of God within you will help you and teach you all things concerning God and your life as the Bible says in
1 John 2:27 "
But the anointing which ye have received of him abideth in you, and ye need not that any man teach you: but as the same anointing teacheth you of all things, and is truth, and is no lie, and even as it hath taught you, ye shall abide in him". If we don't have faith, we can ask God for faith. If we don't have "hope", we need to ask God for "hope". If we don't have enough "Love" for God or for our fellow-human being we can and need to ask God for that too

. So, just like a little child who asks Daddy or Mummy for every thing, we have to approach God and ask Him every thing even for spiritual growth, spiritual virtues, victory over sin, successful married life etc. There are somethings we will find, that God gives, even without our asking. You are sure to find many of your unspoken prayers being answered by Him.
As you continue to know God personally and grow in Him, after a period of time, you would be able to say "God has been like this for me" or "God has not been like that for me". It is just like how you would be able to say about a new-found friend of yours over a period of time. Trust me God is really something more than all the Christians would explain to you. So, i urge you to go on to taste, know and experience God in a way even other christians might not have experienced.
Sorry, if i have talked too much, but i sincerely hope all the above points would encourage you in some way.
Lord bless you.