According to Luke 16:13 (ESV): No servant can serve two masters, for either he will hate the one and love the other, or he will be devoted to the one and despise the other. You cannot serve God ...
Prosperity gospel, as I understand it, is the teaching that God wants to bless us with wealth and health. I can't really see this in the Bible. For example, Paul writes in 2 Cor 12:7-10 (ESV): 7 ...