Only if, like your link, you presuppose that any kind of morality is necessarily contingent on the existence of an objective, God-given morality, without making any argument that this is in fact the case. In order to talk meaningfully about morality (or purpose) you first have to establish what "morality" actually is, and the frame in which we determine moral good from moral evil. If your personal moral framework is solely contingent on the dictates of a higher authority - and nothing else - you essentially shirk your responsibility as a moral agent. What's more, to claim that morality cannot be determined separate of an all-knowing God presupposes that God is necessarily moral; a judgement which, ironically, an individual cannot make without making a moral judgement of their own. In other words, in order to claim that God is moral, you need to first establish that you yourself are capable of determining that which is moral from that which is immoral without the direct influence of a God or Gods. You have to demonstrate that people can determine right from wrong in order to determine that God is right or wrong, which completely defeats the claim that morality can only be determined by God.
No matter what way you slice it, the moral argument for God's existence is an argument from consequence at best and an argument from incredulity at worst, that takes a base and very simplistic view of moral good and arbitrarily assumes it to be the only "true" or "meaningful" moral system that can be said to exist. It's a poorly constructed, self-refuting argument that hasn't got a leg to stand on.
In short: Your argument fails and copying and pasting some website is seriously intellectually lazy. You get an F.