I was an existencialist before converting to Christ, and there is nothing more "tough" philosophically than that, as you should know.
I accepted Christ not because I needed something to take me thru the day, but because I studied it for many years and compared it with many other religions and philosophies. And of course, because of God's opening my eyes thru faith.
In fact, orthodox Christianity, with the full realization that it brings that I am a sinner and a bastard, totally depended on God, makes it much HARDER to face my condition than the false self assurance that I was born perfect provided by gnosticism or new age. Thinking that I am God would be a much better crutch.
You know, with just a little seeking...this central point is what makes Christianity "real".