Hi Oatmeal,
God has you right where He wants you now... where we all have been. When you come to the point where you 'know' you are nothing, then He can pick you up and work with you. We are all 'weak' it is only by His strength that we can do anything.
John 15:5 "I am the vine, you are the branches. He who abides in Me, and I in him, bears much fruit; for without Me you can do nothing.
Eph 2:10 For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand that we should walk in them.
Don't worry about all the 'ifs,' what good is it to worry about what may never happen. Just concern yourself with what 'is.'
Mat 6:34 Therefore do not worry about tomorrow, for tomorrow will worry about its own things. Sufficient for the day is its own trouble.
Concerning what basis we received Christ, well we were all in the church when we first received Him and I guess it could have been under any number of pretenses.
2Tim 1:12 For this reason I also suffer these things; nevertheless I am not ashamed, for I know whom I have believed and am persuaded that He is able to keep what I have committed to Him until that Day.
Now I would suggest you go slowing about 'preaching' to others. You need to get yourself well grounded in these truths before you can teach them to someone else. I think a person may be sympathetic to your new found excitement for 'truth,' until they find out what it is you really believe.
Mat 7:6 Give not that which is holy unto the dogs, neither cast your pearls before the swine, lest haply they trample them under their feet, and turn and rend you.
mercy, peace and love
Kat