You are attempting to spin in a NO SPIN zone!
To understand why we should not use mechanical instruments in worship service it helps tremendously to understand the authority of the Scriptures. There is no authority for use of mechanical instruments in the church worship under the new covenant. In the same way there is no authority for us praying to receive Christ under any covenant. By authority we are commanded to "sing", which does not include mechanical instruments. By authority we are commanded to hear, believe, repent, confess Jesus is Lord, be baptized into Christ, and remain faithful unto death, in order to be saved.
If you pray to receive Christ, not only will you not be saved, you will be doing something that is not authorized in the Scriptures. If you use mechanical instruments, same thing. You are putting yourself in the shoes of Nadab and Abihu... in the shoes of Saul. God commanded a certain kind of fire be offered before Him... Nadab and Abihu offered "strange fire" that God did not command (Leviticus 10). They were destroyed by God. He did not have to tell them what not to do, He expected them to do no more or less than exactly what He commanded. In 1 Samuel 15 we read that Saul was instructed by God to completely and utterly destroy Amalek, all they had, everything... spare no one or nothing. Saul thought he would be wise and save Agag, and the best of the sheep, oxen, fatlings, and the lambs, and all that was good, and would not utterly destroy them because he thought surely God would be pleased with him saving the best to offer as a sacrifice to God. Instead of God being pleased, He was angry. Saul realized that he had sinned and not obeyed what God had commanded. Saul tried to add to what God commanded because he thought it would be pleasing to God, but it wasn't. In the same way, if we try to add to what God has commanded, God will not be pleased with us.
This is how we should all use the Bible to learn the truth of a matter. In NO WAY are we to consider our "conscience" and/or draw conclusions from our conscience. Our conscience will get us in deep trouble if we are not careful. Consider Paul... he himself claimed to be the chief among sinners and he stated that all that he did... all the persecuting Christians he did, was all done in good conscience. (Acts 23:1) Just because our conscience tells us something does not make it right.
Now you say that "there are some things that the Bible does not give a specific example on"... well... the Bible is extremely specific about how to be saved. The Bible clearly teaches hearing, believing, repenting, confessing (not sins), being baptized and remaining faithful unto death. I have proven this with Scripture. Why are you denying Jesus? Why is it that you would not want to do what the Bible so clearly tells us we must do? Your conscience should be telling you to obey God!!!
When we do the things that God has commanded is when we say to God, "God, I accept your gift." We do not accept it until we do those things though.
As far as 1 John 1:9... John is writing to Christians, not unsaved sinners. If you will study all of 1 John you will clearly see that John is writing to those who are already saved. He is not telling the unsaved how to be saved. Even a Baptist theologian will confirm this for you. When a Christian sins we must repent, confess those sins and ask God for forgiveness... He is faithful and will forgive us and the blood of Jesus will continue to cleanse us.
mvw... please, for you own soul's sake... and in obedience to God, do what He has commanded of you to do. Stop trying to find a way around it... it is so vividly explained in detail that anyone should be able to see the truth. I pray for you right now.