This is a well known argument called 'Pascal's Wager', advanced by the French philosopher Blaise Pascal in the 17th century.
Pascal's wager seems, on the face of it, a reasonable proposition, but in fact, it's flawed in quite a lot of ways.
Belief cannot be engendered through will, any more than an erection can be engendered by mere will (and if you're male and don't believe this last point, command yourself to get an erection this very second...)
Just because an individual determines it makes more sense to believe in God than not, it does not axiomatically follow that it is possible to have that belief.
It also assumes that God will not distinguish between those who believe because the wager seems convincing and therefore wish to aim to stay out of hell, and those who believe genuinely.
It is based on a 'pick and choose' God - where the unpleasant, immoral aspects of the Biblical God are ignored in favour of a nice, fluffy God.
It assumes the Judeo-Christian God is the right one, not some other religion's deity.
It assumes the cost of belief and the cost of non-belief are the same.
It assumes the evidence in favour of God is at least equivalent to the evidence against God.
It assumes atheists are immoral, and that God wouldn't take their actions into account.
If true, the same wager could be applied to contradictory beliefs. Sam Harris, the prominant US atheist, notes "Muslims could use it to support the claim that Jesus was not divine (the Koran states that anyone who believes in the divinity of Jesus will wind up in hell); Buddhists could use it to support the doctrine of karma and rebirth; and the editors of TIME could use it to persuade the world that anyone who reads Newsweek is destined for a fiery damnation."
It's a very badly flawed argument.