Anyone with average reading comprehension can see that you're dead wrong.
The meaning that you're attempting to pour into this verse is pure eisogesis. Had you bothered to read the next few verses you would have seen that it just doesn't help your case. Let's look at your text in context.
Mat 7:7 "Ask, and it will be given to you; seek, and you will find; knock, and it will be opened to you.
Mat 7:8 For everyone who asks receives, and the one who seeks finds, and to the one who knocks it will be opened.
Mat 7:9 Or which one of you, if his son asks him for bread, will give him a stone?
Mat 7:10 Or if he asks for a fish, will give him a serpent?
Mat 7:11 If you then, who are evil, know how to give good gifts to your children, how much more will your Father who is in heaven give good things to those who ask him!
1. There is absolutely no reference to salvation in this text. That's not what its about at all.
2. The instructions embodied in this text are for disciples. That is, those who are already saved. Don't believe me? Look at verse 6 in this discourse. This would only apply to a believer.
Mat 7:6 "Do not give dogs what is holy, and do not throw your pearls before pigs, lest they trample them underfoot and turn to attack you.
3. Most importantly, when we get to verse 11 we've come full circle. The asking, seeking and knocking pertains to the "good things" the Father will give to those who ask. I'm sorry, but you can't force salvation into this text.