what made constantine suppurt christianity?

Answer 1

Constantine began to support Christianity when his life changed. According to Constantine, the Greek letters for the word Christ- chi rho- appeared in the sky above hom. Over these letters were the Latin word- in hoc signo vinces- meaning " In this sign you will conquer."So Constantine ordered his soldiers to paint crosses on their sheilds. The cross was a symbol of Christianity because Jesus had died on the cross for our sins.

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Answer 2

Frankly, we don't know.

Here are some guesses.

http://en.wikipedia.org/wiki/Constantine_I_and_Christianity